When a mosquito bites a person, it injects some chemicals into your skin and your body identifies that chemical as foreign body, then it releases some chemicals called as histamines, which thinks that the foreign body should be destroyed, and when the histamine is released into the skin it causes redness, swelling, itching and irritation, so this is a common symptom for everybody. But when it persists beyond a particular time, even after 2 or 3 days, the swelling is not reducing, then swelling, itching, is there then you are allergic to that particular substance that is injected by the mosquito or that insect. so if you are allergic to that particular thing, then you develop these kind of rashes ,then you do a blood test to find your IgE levels are quite high, like 600 IU per ml, then definitely it can be treated, it can be corrected. So there are specific medicines in homeopathy to improve the function of the immune cell and the allergy levels can gradually come down.
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