Mosquito bites, while annoying, are typically harmless and resolve on their own after a few days. However, mosquito bites that occur in areas where malaria, yellow fever, and dengue are common may be more dangerous.
In some cases, mosquitoes can transmit diseases. When biting an infected person or animal, a mosquito picks up a virus or parasite and can then transmit that virus or parasite to you through its saliva.
What are common symptoms of mosquito bites?
Mosquito bites are itchy bumps that occur when a female mosquito punctures your skin and feeds on your blood. When a mosquito bites, it injects saliva into your skin. Proteins in the saliva cause a mild immune response, resulting in the characteristic itching and bump.
Symptoms of mosquito bites may include:
- Puffy, white, or reddish bump that may appear a few minutes after the bite
- Hard, itchy, reddish-brown bumps that appear a day or so after the bite
- Small blisters
- Dark spots (may look like bruises)
Although symptoms usually go away on their own after a few days, a mosquito bite can occasionally cause more severe reactions, especially in people with weak immune systems. These symptoms may include:
Children have stronger reactions than adults because many adults have been bitten by mosquitoes throughout their lives and have grown desensitized. Some people become less sensitive to mosquito saliva after repeated exposure. However, others may develop allergic reactions. Symptoms of an allergic reaction may include:
If you have a severe allergic reaction to a mosquito bite, seek medical attention.
When are mosquito bites dangerous?
Mosquitoes have the ability to transmit diseases to humans. Diseases caused by mosquito bites account for millions of deaths every year. Some of the most dangerous mosquito-borne diseases include the following:
If you are going to an area where this condition is common (such as sub-Saharan Africa, India, or the tropics in general), talk to your doctor about whether malaria preventive medications are needed.
Yellow fever is most common among Americans who go to tropical countries of Africa, and Central and South America. It is characterized by fever, headache, muscular pain, vomiting, and, in rare cases, jaundice.
According to the WHO, there is a vaccination to prevent the sickness, and a single injection provides lifelong protection.
Zika virus has been associated with microcephaly, a birth condition in which an infant's head is smaller than usual. Aedes aegypti mosquitoes spread the Zika virus. People who have already been bitten by infected Aedes mosquitoes are immune to it, restricting its spread.
West Nile virus can be found across the U.S. Most infected people exhibit no or few symptoms. If people become aware of the illness, the symptoms will be flu-like (fever, headache, and body aches). The body will normally fight off the virus on its own, without therapy.
Although the same mosquito species that causes Zika spreads dengue, people in the U.S. are seldom in danger unless they travel outside the country.
Dengue fever is a primary cause of death in tropical and subtropical climates. If you reside in or are visiting a dengue-endemic area, it is best to avoid mosquito bites if possible; there is no vaccination to prevent the infection.
This virus, which is also transmitted by the Aedes aegypti mosquito, can cause high fever, headaches, and joint discomfort that can last years. Unfortunately, there is no way to prevent or treat chikungunya.
St. Louis encephalitis
How can I prevent mosquito bites?
The most effective way to avoid mosquito-borne illness is to avoid mosquito bites. The Centers for Disease Control and Prevention has the following recommendations:
- Use repellent: Use insect repellent when you go outside. Longer-lasting protection is provided by repellents containing DEET, picaridin, IR3535, and some products containing oil of lemon eucalyptus and para-menthane-diol.
- Wear proper clothing: When mosquitoes are most active, wear long sleeves and pants. Some mosquito species are active between dusk and dawn. Others, such as the Aedes species mosquito that transmits Zika, are active during the day.
- Window screens: Repair window and door screens. If available, use air conditioning.
- Remove standing water: Remove standing water from containers such as flower pots, gutters, buckets, pool covers, pet water dishes, discarded tires, and birdbaths.
How to treat mosquito bites
If a mosquito bite does not cause a severe allergic reaction, you can treat it at home:
- Warm water and soap: Cleanse the affected area gently with warm water and soap. Baking soda and water can also relieve itching.
- Ice: Apply an ice pack or a frozen bag of vegetables over the bite to reduce swelling and inflammation.
- Over-the-counter antihistamines: These can help manage swelling and itching.
- Over-the-counter hydrocortisone or anti-itch cream: These can relieve symptoms such as itching and inflammation.
Although it may be difficult to not rub or scratch the area where you were bitten, the more you scratch it, the worse the reaction will be. Your nails carry bacteria, and breaking the skin with your nails can result in an infection.
Although mosquito bites can often heal without treatment, sometimes within a few days, they can cause complications. Seek immediate medical attention if you experience severe symptoms as a result of the bite.
- The Predicted 'Tripledemic' Is Here: Why Isn't There an RSV Vaccine?
- Frozen Stuffed Chicken Products & Microwave Ovens: A Recipe for Salmonella
- First FDA-Approved Fecal-Based Treatment Helps Fight a Tough Superbug
- Seizures Seem Tied to Faster Decline in People With Dementia
- Signs That COVID Infection Might Harm the Liver
- More Health News »
Health Solutions From Our Sponsors
Mosquito Bite Symptoms and Treatment: https://www.cdc.gov/mosquitoes/mosquito-bites/symptoms.html
Take a Bite Out of Mosquito Stings: https://www.aaaai.org/tools-for-the-public/conditions-library/allergies/taking-a-bite-out-of-mosquitoes
Mosquito Bites: https://www.ncbi.nlm.nih.gov/books/NBK539915/
Top Is It OK If a Mosquito Bites You Related Articles
Mosquito RepellentsMosquito bites are itchy, annoying, and can even make you sick. Find out what works (and what doesn't) to protect you from these blood-sucking bugs.
Bad Bugs: Identify Insects and Bug BitesWhat do bug bites look like? How do you treat bug bites? Why do bug bites burn? See spider bite pictures and learn how to identify bug bites from mosquitoes, bees, bed bugs, wasps, and more. See what their bites & stings look like and how to treat bug bites. For more details, enter a search for the specific insects or bugs as this slideshow is a brief introduction to the topic.
How Do You Know If You Are Allergic to Mosquito Bites?Mosquito bite allergies can cause issues if untreated. Learn the signs of a mosquito bite allergy, what causes it, and what you can do to treat it.
8 First Aid Kit Essentials for Scrapes, Cuts, Bug Bites, and MoreAre you always prepared for a first aid crisis? See which basic first aid items to pack to treat minor scrapes, cuts, and stings when you're on the go.
Home Remedies for Mosquito BitesMosquito bites appear as red, itchy rashes, which resolves in a few days. A few mosquitoes act as a vector to spread diseases like Malaria, West Nile virus, Yellow fever, Dengue, Chikungunya, Encephalitis (brain infection), and Zika virus.
How Do You Stop Mosquito Bites From Itching?Mosquito bites can be irritating. Learn what causes the itch and how to stop it.
Summer Skin QuizWhen it comes to summer, there plenty of hazards under the sun! Take the Summer Skin Hazards Quiz and clue in on the dangers to your summer skin!
Which Is the Most Effective Mosquito Repellent?The most effective mosquito repellent is N,N-Diethyl-meta-toluamide (DEET), also called diethyltoluamide.
Why Do Mosquitoes Suck Your Blood?Female mosquitoes bite and suck blood due to its iron, protein, and amino acid content that is essential for the development of their eggs.