What should I do if I have an allergic skin reaction with redness and itching after a mosquito bite?

If a skin allergy occurs due to a mosquito bite, resulting in redness and itching, scratching the affected area should be avoided to prevent worsening of the allergic reaction and increased risk of infection. Secondly, immediately clean the bite area using mild soap and water or an anti-allergy cleansing solution to help reduce swelling and itching. Next, apply an anti-allergy topical ointment, such as one containing antihistamine ingredients, to relieve allergic symptoms. If symptoms persist or worsen, oral antihistamines may be taken, though this should be done under a doctor's guidance. At the same time, keep the affected area clean and dry to avoid irritation. Maintain good skin hygiene, avoid scratching with the hands to prevent skin infection, and ensure fresh indoor air. If allergic symptoms do not subside or worsen, seek medical attention promptly.