Bumps on Skin

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People often describe localized swollen areas on, or under, the skin as lumps or bumps. While bumps on, or under, the skin may result from conditions that give rise to a skin rash, many other conditions can result in solitary raised lumps on the skin. Infections, tumors, and the body's response to trauma or injury can all lead to lumps or bumps that appear to be located on or underneath the skin.

Depending upon the cause, skin lumps or bumps may vary in size and be firm or soft to the touch. The overlying skin may be reddened or ulcerated. Skin bumps may or may not be painful or tender, depending upon the cause of the lesions.

Medically Reviewed by a Doctor on 7/15/2014

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REFERENCE:

Fauci, Anthony S., et al. Harrison's Principles of Internal Medicine. 17th ed. United States: McGraw-Hill Professional, 2008.

Causes of Bumps on Skin
    • Acne (Pimples) Acne is a localized skin inflammation as a result of overactivity of oil glands at the base of hair follicles. This...learn more »
      In This Article
      Acne (Pimples) Article
      • What is acne?
      • What causes acne?
      • What other skin conditions can mimic acne?
      • When should you start acne treatment?
      • What can you do about acne on your own?
      • What are other things you can do for acne? Are there any home remedies for acne?
      • What is a good basic skin regimen?
      • What can the doctor do for acne?
      • How would you sum up current-day acne treatment?
    • Actinic Keratosis Actinic keratoses are rough, scaly patches of skin that are considered precancerous and are due to sun exposure. Prevention is to...learn more »
      In This Article
      Actinic Keratosis Article
      • Actinic keratosis facts
      • What is an actinic keratosis, and what does it look like?
      • Who is at risk for an actinic keratosis?
      • Where on the body do actinic keratoses typically occur?
      • What is the significance of an actinic keratosis?
      • How is an actinic keratosis diagnosed?
      • How is an actinic keratosis treated?
      • What happens after an actinic keratosis is treated?
    • Birthmark Birthmarks and other abnormal skin pigmentation is caused by the body's inability to produce enough melanin. Abnormal skin...learn more »
      In This Article
      Birthmark Article
      • Birthmark facts
      • What is a birthmark?
      • What are the different types of birthmarks?
      • What are the characteristics of pigmented birthmarks?
      • What are the characteristics of vascular birthmarks?
      • What causes birthmarks?
      • Are any symptoms and signs associated with birthmarks?
      • What disorders are associated with birthmarks?
      • Can skin damage during delivery produce a birthmark?
      • Does insurance cover the cost of birthmark removal?
      • Is it possible to remove or fade birthmarks?
      • What is the treatment for birthmarks?
      • What is the prognosis of birthmarks?
    • Boils A boil is a skin abscess, a collection of pus localized deep in the skin. There are several different types of boils. Among them...learn more »
      In This Article
      Boils Article
      • Boils facts
      • What is a boil? What are the symptoms and signs of a boil?
      • What causes boils to form?
      • Who is most likely to get a boil?
      • How are boils diagnosed?
      • What is the treatment for a boil?
      • When should I seek medical attention for a boil?
      • What is the prognosis (outcome) for a boil?
      • What can be done to prevent boils (abscesses)?
    • Bug Bites and Stings Bug bites and stings have been known to transmit insect-borne illnesses such as West Nile virus, Rocky Mountain spotted fever,...learn more »
      In This Article
      Bug Bites and Stings Article
      • Bug bites and stings facts*
      • Bug bites and stings introduction
      • What can I do to keep insects away?
      • What's the proper way to use insect repellent?
      • What's the best way to remove a bee stinger?
      • What should I do if I find a tick on me or my child?
      • What can be done for itching and pain from bites and stings?
      • When is medical attention needed?
      • Where can I find more information on bug bites and stings?
    • Cellulitis Cellulitis is an acute spreading bacterial infection below the surface of the skin characterized by redness, warmth,...learn more »
    • Chickenpox (Varicella) Chickenpox (chicken pox) is a contagious childhood disease caused by the varicella-zoster virus. Symptoms have an incubation...learn more »
      In This Article
      Chickenpox (Varicella) Article
      • Chickenpox facts
      • What is chickenpox? What causes chickenpox?
      • How does chickenpox spread?
      • What are chickenpox symptoms and signs?
      • What are treatment options for chickenpox?
      • What are the possible complications of chickenpox?
      • Can chickenpox be prevented with a vaccine?
    • Contact Dermatitis Contact dermatitis is a rash that occurs after exposure to an irritating substance. Symptoms include a red, elevated rash at the...learn more »
      In This Article
      Contact Dermatitis Article
      • Contact dermatitis facts
      • What is contact dermatitis?
      • What causes contact dermatitis?
      • What are risk factors for contact dermatitis?
      • What are contact dermatitis symptoms and signs?
      • How is contact dermatitis diagnosed?
      • What is the treatment for contact dermatitis?
      • What is the prognosis of contact dermatitis?
      • Can contact dermatitis be prevented?
    • Corns Corns and calluses are sometimes painful areas of thickened skin that appear between the toes and fingers or on the soles of the...learn more »
      In This Article
      Corns Article
      • Corns and calluses facts
      • What are corns and calluses?
      • Why do corns and calluses develop?
      • What are risk factors for corns and calluses?
      • What are symptoms and signs of corns and calluses?
      • How are corns and calluses diagnosed?
      • How can corns and calluses be treated?
      • When should someone seek professional treatment for corns or calluses?
      • What is the prognosis for corns and calluses?
      • How can corns and calluses be prevented?
    • Cyst Cysts are sac-like structures that may be filled with gas, liquid, or solid materials. Cysts may produce symptoms depending on...learn more »
      In This Article
      Cyst Article
      • Cyst facts
      • What is a cyst?
      • What causes a cyst?
      • What are risk factors for a cyst?
      • What are cyst symptoms and signs?
      • How do physicians diagnose a cyst?
      • What is the treatment for a cyst?
      • What is the prognosis of a cyst?
      • Is it possible to prevent a cyst?
    • Gout (Gouty Arthritis) Buildup of uric acid crystals in a joint causes gouty arthritis. Symptoms and signs include joint pain, swelling, heat, and...learn more »
      In This Article
      Gout (Gouty Arthritis) Article
      • Gout facts
      • What is gout?
      • What causes gout?
      • What are risk factors for gout?
      • What are symptoms and signs of gout?
      • How is gout diagnosed?
      • When should gout be treated?
      • What is the treatment for gout?
      • Do gout medications have any side effects?
      • What foods should people with gout avoid?
      • What complications are associated with gout?
      • What is the prognosis of gout?
      • Is it possible to prevent gout?
      • What research is being done on gout?
    • Impetigo Impetigo is a contagious skin infection caused by staph and strep bacteria. There are two types of impetigo: non-bullous and...learn more »
      In This Article
      Impetigo Article
      • Impetigo facts
      • What is impetigo? What causes impetigo?
      • What are the types of impetigo, and what are impetigo symptoms and signs? What does impetigo look like?
      • Is impetigo contagious?
      • How is impetigo diagnosed?
      • What is the treatment for impetigo?
      • What are possible complications of impetigo?
      • Will impetigo leave scars?
      • Can impetigo be prevented?
    • Insect Sting Allergies The majority of stinging insects in the United States are from Bees, Yellow Jackets, Hornets, Wasps and Fire Ants. Severity of...learn more »
      In This Article
      Insect Sting Allergies Article
      • Stinging insect allergy facts
      • What are stinging insects?
      • Who is at risk for insect sting allergies?
      • What types of insect sting reactions occur?
      • How is a severe allergic reaction immediately treated?
      • How can I avoid insect stings?
      • What can I do about becoming immune to insect allergy?
    • Jock Itch Jock itch is an itchy red rash that appears in the groin area. The rash may be caused by a bacterial or fungal infection. People...learn more »
      In This Article
      Jock Itch Article
      • Jock itch facts
      • What is jock itch? What does jock itch look like?
      • What causes jock itch?
      • Who gets jock itch?
      • What are jock itch symptoms and signs?
      • Does jock itch affect the entire body?
      • How is jock itch diagnosed?
      • Is jock itch curable? Is jock itch contagious?
      • What are possible complications of jock itch?
      • What is the treatment for jock itch?
      • What home remedy can I use for jock itch?
      • What holistic jock itch treatments are available?
      • How do I treat fungal jock itch?
      • How do I treat bacterial jock itch?
      • How is itching from jock itch treated?
      • Why is my groin still discolored?
      • What is the best drug for jock itch?
      • What is the prognosis with jock itch?
      • When should I call my doctor about jock itch?
      • How do I prevent jock itch?
    • Keloid A keloid is a scar that doesn't know when to stop. When the cells keep on reproducing, the result is an overgrown (hypertrophic)...learn more »
      In This Article
      Keloid Article
      • What is a keloid?
      • What is the difference between a keloid and a hypertrophic scar?
      • What are keloid symptoms and signs?
      • What is the cause of keloids?
      • Which people are most susceptible to keloids?
      • In which area of the body are keloids most likely to appear?
      • Keloids and piercing
      • Is keloid prevention possible?
      • Is keloid removal necessary?
      • What are the treatments for keloids?
    • Melanoma Second Source article from Government...learn more »
    • Melanoma Melanoma is a type of skin cancer which begins in skin cells called melanocytes and affects more than 53,600 people in the United...learn more »
      In This Article
      Melanoma Article
      • Melanoma facts
      • Introduction
      • What does melanoma look like? What are the symptoms and signs?
      • What if the skin changes are rapid or dramatic?
      • What are the causes and risk factors for melanoma?
      • How do I know my level of risk for melanoma?
      • What are the types of melanoma?
      • How is melanoma diagnosed?
      • How do doctors determine the prognosis (outlook) of a melanoma?
      • What is the treatment for melanoma?
      • What methods are available to help prevent melanoma?
      • Conclusions
      • What is in the future for melanoma?
      • Additional Resources
    • Molluscum Contagiosum Molluscum contagiosum is a skin disease that causes pink painless bumps on the skin. It typically resolves in six to 12 months....learn more »
      In This Article
      Molluscum Contagiosum Article
      • Molluscum contagiosum facts
      • What is molluscum contagiosum?
      • What causes molluscum contagiosum?
      • What are risk factors for molluscum contagiosum?
      • What are molluscum contagiosum symptoms and signs?
      • How do physicians diagnose molluscum contagiosum?
      • What is the treatment for molluscum contagiosum?
      • Are there any home remedies for molluscum contagiosum?
      • What is the prognosis of molluscum contagiosum?
      • Is it possible to prevent molluscum contagiosum?
    • MRSA MRSA (methicillin resistant Staphylococcus aureus) bacteria causes skin infections with the following signs and symptoms:...learn more »
      In This Article
      MRSA Article
      • MRSA infections facts
      • What is methicillin-resistant Staphylococcus aureus (MRSA)?
      • What does a MRSA infection look like?
      • What are the risk factors for MRSA infections?
      • What are the signs and symptoms of a MRSA infection?
      • How is a MRSA infection transmitted or spread?
      • How is a MRSA infection diagnosed?
      • How should caregivers treat MRSA patients at home?
      • What is the treatment for a MRSA infection?
      • What is the prognosis (outlook) of a MRSA infection?
      • How can people prevent a MRSA infection?
      • What are the potential complications of a MRSA infection?
      • What is a "superbug"?
      • Where are other MRSA information sources?
    • Psoriasis Psoriasis is a long-term skin condition that may cause large plaques of red, raised skin, flakes of dry skin, and skin scales....learn more »
    • Rash The word "rash" means an outbreak of red bumps on the body. The way people use this term, "a rash" can refer to many different...learn more »
      In This Article
      Rash Article
      • Rash facts
      • What are the causes, symptoms, and signs of common noninfectious rashes?
      • How are common skin rashes diagnosed?
      • Scaly patches of skin produced by fungal or bacterial infection
      • What is the treatment for a rash?
    • Rheumatoid Arthritis Rheumatoid arthritis is an autoimmune disease that causes chronic inflammation of the joints, the tissue around the joints, as...learn more »
      In This Article
      Rheumatoid Arthritis Article
      • Rheumatoid arthritis (RA) facts
      • What is rheumatoid arthritis (RA)?
      • What are causes and risk factors of rheumatoid arthritis?
      • What are rheumatoid arthritis symptoms and signs?
      • What are complications of rheumatoid disease?
      • How do physicians diagnose rheumatoid arthritis?
      • What is the treatment for rheumatoid arthritis?
      • "First-line" rheumatoid arthritis medications
      • "Second-line" or "slow-acting" rheumatoid arthritis drugs
      • What are newer treatments for rheumatoid arthritis?
      • What about rheumatoid arthritis and pregnancy?
      • Rheumatoid arthritis diet and other treatments
      • What is the prognosis (outlook) for patients with rheumatoid arthritis?
      • Is it possible to prevent rheumatoid arthritis?
      • What research is being done on rheumatoid arthritis?
      • Where can people get additional information on rheumatoid arthritis?
    • Rosacea Rosacea is a skin disease that causes redness of the forehead, chin, and lower half of the nose. In addition to inflammation of...learn more »
      In This Article
      Rosacea Article
      • Rosacea facts
      • What is rosacea? Is rosacea contagious?
      • Is rosacea like acne?
      • What are causes and risk factors of rosacea?
      • What are rosacea symptoms and signs?
      • How is rosacea diagnosed?
      • What happens to the nose and the eyes?
      • How is rosacea cured?
      • What about using acne medicine?
      • What is the treatment for rosacea?
      • What should be avoided? What foods are good for rosacea?
      • What natural remedies can help rosacea?
      • Does rosacea get worse with age?
      • How should I care for the skin of my face?
      • How are the telangiectasias (the red lines) treated?
      • How is a rhinophyma (the W.C. Fields nose) treated?
      • What effect may rosacea have on my life?
      • Where can people get more information about rosacea?
    • Scabies Scabies are itch mites that burrow under the skin and produce intense itching that's usually worse at night. Symptoms of scabies...learn more »
    • Scarlet Fever (Scarlatina) Scarlet fever, a bacterial infection caused by group A Streptococcus bacteria, causes symptoms and signs such as fever, rash with...learn more »
      In This Article
      Scarlet Fever (Scarlatina) Article
      • Scarlet fever facts
      • What is scarlet fever?
      • What causes scarlet fever?
      • What is the incubation period for scarlet fever?
      • What are risk factors for scarlet fever?
      • What is the contagious period for scarlet fever?
      • What are scarlet fever symptoms and signs?
      • How do physicians diagnose scarlet fever?
      • What is the treatment for scarlet fever?
      • What are complications of scarlet fever?
      • What is the prognosis of scarlet fever? What are the long-term effects of scarlet fever?
      • Is it possible to prevent scarlet fever? Is there a scarlet fever vaccine?
    • Skin Cancer Skin cancers occur when skin cells undergo malignant transformations and grow into tumors. The most common types of skin cancer,...learn more »
      In This Article
      Skin Cancer Article
      • What is skin cancer?
      • What are the risk factors for skin cancer?
      • What causes skin cancer?
      • What are the different types of skin cancer?
      • What are the signs and symptoms of skin cancer?
      • When is a mole dangerous or high-risk for becoming a skin cancer?
      • What are the most common sites where skin cancer develops?
      • How is skin cancer diagnosed?
      • What is the staging for skin cancer?
      • What is the treatment for skin cancer?
      • What is the prognosis for skin cancer?
      • Can skin cancer be prevented?
      • Sunscreen use and vitamin D
    • Skin Tag A skin tag is a small benign growth of skin that projects from the surrounding skin. Skin tags can vary in appearance (smooth,...learn more »
    • Sporotrichosis Sporotrichosis is a skin infection caused by a fungus called Sporothrix schenckii. The fungus, which may be present in sphagnum...learn more »
      In This Article
      Sporotrichosis Article
      • What is sporotrichosis?
      • What causes sporotrichosis?
      • Who gets sporotrichosis?
      • What are the signs and symptoms of sporotrichosis?
      • How is sporotrichosis diagnosed?
      • How is sporotrichosis treated?
      • How can sporotrichosis be prevented?
    • Swollen Lymph Nodes Lymph nodes help the body's immune system fight infections. Causes of swollen lymph nodes (glands) may include infection (viral,...learn more »
      In This Article
      Swollen Lymph Nodes Article
      • Swollen lymph nodes facts
      • What are lymph nodes?
      • Where are the lymph nodes located in the body?
      • Picture of lymph nodes located in the body
      • What are the causes of swollen lymph nodes?
      • What are the symptoms of swollen lymph nodes?
      • How are swollen lymph nodes diagnosed?
      • What is the treatment for swollen lymph nodes?
      • When should I see the doctor for swollen lymph nodes?
      • What are the common lymph nodes that may become swollen?
      • What are the complications of swollen lymph nodes?
    • Warts (Common Warts) Common warts are skin growths causes by the human papillomavirus. There are many types of warts, including plantar warts, common...learn more »
      In This Article
      Warts (Common Warts) Article
      • Wart facts
      • What are warts?
      • What are some types of warts?
      • What is the treatment for warts?
      • Is using over-the-counter wart treatments safe?
      • Are wart treatments effective?
      • What if wart removal treatments fail?
Other Causes of Bumps on Skin



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