What is seborrheic keratoses?
Seborrheic keratoses are skin growths that typically first appear when you reach middle age. They often show up on your temples or torso. People with darker skin can experience multiple seborrheic keratosis growths on their cheekbones called dermatosis papulosa nigra.
The size of seborrheic keratoses can vary, and they tend to grow slowly. They are often round or oval-shaped and can be brown, black, or flesh-colored. Their texture can vary from person to person and be waxy, crusty, scaly, or velvety.
Seborrheic keratoses are caused by a build-up of skin cells in your epidermis (the top layer of your skin), including cells called keratinocytes. Older cells typically get replaced by newer cells when they flake off. Sometimes the keratinocytes in this layer grow faster than normal, resulting in a keratosis.
Seborrheic keratoses are usually benign, but they can look similar to cancerous growths.
Signs of seborrheic keratoses
Seborrheic keratoses may:
- Have a raised surface
- Appear to be pasted on
- Look similar to a wart or a scaly skin growth
- Stand out from surrounding skin
Seborrheic keratoses can range in color from white to black, but most are tan or brown. Some people develop a cluster of growths in one area.
The condition can be mistaken for other skin issues like moles, skin tags, or warts. Seborrheic keratoses can also itch or become irritated when clothing rubs against them.
Causes of seborrheic keratoses
There is no known cause of seborrheic keratoses. However, some research has found common factors among those who experience them. The growths appear to run in families. Exposure to the sun also seems to play a role in developing seborrheic keratoses.
While seborrheic keratoses are most common in older people, they can appear as early as adolescence. Women who are pregnant or have taken estrogen may also develop them. Seborrheic keratoses rarely occur in children.
If you develop large seborrheic keratoses or they grow rapidly, you could have cutaneous paraneoplastic syndrome. This condition appears in patients diagnosed with cancerous tumors elsewhere in the body.
The disorder is often found in people with the following kinds of cancer:
- Lung cancer
- Leukemia
- Renal cell carcinoma (a type of kidney cancer)
- Breast cancer
- Lymphoma
- Ovarian tumors
- Stomach cancer
- Pancreatic cancer
When to see the doctor for seborrheic keratoses
You may want to see your doctor if you notice any of the following:
- New skin growths
- Moles that appear to be getting wider
- Growths that appear uneven
- Moles with blurry borders
- Itchiness in an older mole
- A diagnosed seborrheic keratosis that starts looking differently
It can help to write down any questions you have about your skin growths. Make sure to bring your medical history, and inform your doctor of any medications you are taking that could affect the appearance of your seborrheic keratoses.

IMAGES
Eczema Browse our medical image collection of allergic skin disorders such as psoriasis and dermatitis and more caused by allergies See ImagesDiagnosis for seborrheic keratoses
To diagnose your seborrheic keratoses, your doctor will look at them. If your doctor suspects that your growths may be cancerous, they may order a skin biopsy to confirm a diagnosis.
Treatments for seborrheic keratoses
You should not attempt to remove a seborrheic keratosis on your own. You could misdiagnose it, which could allow a more serious medical condition to go undiagnosed. You could also cause an infection.
Most seborrheic keratoses do not require treatment. If a growth becomes uncomfortable, your doctor may recommend one of the following:
- Liquid nitrogen — Your doctor may use this compound to freeze seborrheic keratoses, causing them to fall off
- Surgery — Your doctor may use a numbing cream and a scalpel to cut off the growth or burn the growth off with electricity
Growths removed using one of these methods usually do not grow back. If they do return, your doctor may want to biopsy your skin to make sure the lesions are not cancerous.
Your skin may appear lighter in the area where a seborrheic keratosis was removed. This can fade with time or may be permanent
American Academy of Dermatology Association: "Seborrheic Keratoses: Overview."
American Academy of Dermatology Association: "Seborrheic Keratoses: Who Gets and Causes."
Cedars-Sinai: "Seborrheic Keratosis."
Kaiser Permanente: "Seborrheic Keratoses."
Merck Manual: "Paraneoplastic Syndromes."
Merck Manual: "Seborrheic Keratoses."
Top What Triggers Seborrheic Keratoses Related Articles
How Can You Tell the Difference Between Melanoma and Seborrheic Keratosis?
Learn the difference between melanoma and seborrheic keratosis and how to treat each condition.Skin 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 skin conditions. The most common of these are scaly patches of skin and red, itchy bumps or patches all over the place.Seborrheic Dermatitis
Seborrheic dermatitis is a chronic skin condition. Symptoms and signs include a red, scaling rash on the scalp, face, ears, and torso. Treatment often includes the use of a medicated shampoo and the application of a topical steroid lotion.Seborrheic Keratosis Picture
A benign skin disorder due to excessive growth of the top layer of skin cells, usually found in persons over 30 years old. See a picture of Seborrheic Keratosis and learn more about the health topic.Skin Problems as You Age
Aging skin can cause wrinkles, liver spots, and leg sores. Learn the cause of spider and varicose veins. See pictures of skin tags, actinic keratosis, and seborrheic keratosis. Learn how to care for skin to prevent aging conditions like solar elastosis and cherry angiomas.Skin Problems: Rosacea, Acne, Shingles, Covid-19 Rashes
Learn to spot and treat skin conditions commonly found in adults such as acne, Covid-19 rashes, eczema, shingles, psoriasis, rosacea, hives, cold sores, razor bumps, athlete's foot, and more dermatology details.Skin Conditions Below the Waist
Skin conditions like acne, eczema, psoriasis, and allergies may produce redness and other symptoms. See your dermatologist right away if you develop itchy skin, rashes, pimples, or other skin conditions. Dermatology experts are best if you suspect skin cancer or other serious skin disease.urea
Urea is an emollient used in the treatment of many skin disorders that cause dry, rough, thick, and scaly skin, including dermatitis, eczema, psoriasis, keratosis pilaris, corns, calluses, ingrown nails, and more. Common side effects of urea include local irritation, transient stinging of the skin, transient burning sensation, itching (pruritus), redness, and rash. Applying too much urea products on the skin can cause irritation, redness, itching and pain.