Mosquito bite allergy: how to recognize and treat it?

Mosquito bite usually causes a mild, harmless and transient skin reaction. But in some people, an allergic reaction can occur.  The characteristic symptoms and the treatments to relieve it. When the mosquito bites (only females), it pumps some of our blood at the same time as it injects a small amount of its saliva. This contains molecules that anesthetize and prevent blood clotting.  They cause a reaction in our immune system which then begins to release histamine, the substance responsible for the inflammatory reaction at the origin of the mosquito button.

What are the symptoms of mosquito bite?

The mosquito bite almost always causes local irritation which results in a small red or pink itchy pimple. The papule does not exceed 20 millimeters and the itching most often disappears within a few hours. A few minutes after the bite, the area may be hard and show redness. But luckily, the inflammation and itching only last a few days. The sting heals on its own. There are local treatments to relieve the discomfort caused by itching.

How to recognize an allergy to mosquito bites?

We talk about allergy to mosquito bites when they are the cause of a large button accompanied by a significant local erythema that can reach 50 millimeters in diameter. These symptoms appear almost immediately after the bite and last a few hours. In some cases, the bite can swell the entire limb – the leg or the arm – and be accompanied by vomiting and fatigue.

The local allergic reaction can also appear later, that is, several hours after the bite. The inflammatory reactions can then reach 12 to 15 centimeters in diameter and persist for several days to several weeks.

The mosquito bite can cause anaphylactic reactions (breathing difficulties, swelling of the face, giant urticaria, etc.), but this is rare. Anaphylactic shock associated with angioedema is more common in bee stings.

What is Skeeter Syndrome? The mosquito bite can exceptionally be the cause of “Skeeter syndrome”, a widespread local inflammatory reaction accompanied by  fever and sometimes vomiting and respiratory disorders such as asthma. Anaphylactic shock and Skeeter’s syndrome are two medical emergencies. Infants, young children, and people with primary or secondary immunodeficiency are most prone to mosquito bite allergy.

How to treat allergy to mosquito bites?

The primary objective is to calm the inflammation. There are medicinal solutions and natural solutions.


To calm the inflammation, corticosteroids can be applied topically in the form of drops or cream. Another option is antihistamines in creams or tablets. In the presence of anaphylactic shock, an injection of epinephrine must be immediately performed to calm the symptoms. People prone to anaphylactic shock always have an epinephrine auto-injector with them in case of emergency.


Mosquito bite allergy can also be relieved with essential oils and homeopathy.

The naturopath recommends the essential oil of true lavender combined with the essential oil of rosegeranium . Mix 10 drops of each and then apply 2 to 3 drops directly to the bite. To quickly reduce the irritation, it is possible to dilute the essential oils with aloe vera gel, known for its soothing and healing properties. Several homeopathic treatments are indicated in case of allergy to mosquito bites or in prevention:

Apis Mellifica  15 CH: 5 granules 3 times in a row, to be taken 10 minutes apart, 3 times a day until the itching stops. Ledum palustre 5 CH + Caladium seguinum 5 CH: 5 granules of each per day for the duration of exposure to mosquitoes. I recommend it in prevention to children and pregnant women, two groups that particularly attract mosquitoes the Cicaderma ointment : Apply directly on the bite.

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