What should I do if my skin becomes red, itchy, and allergic after being bitten by a mosquito?

When experiencing skin allergies, redness, and itching caused by mosquito bites, the following measures can help alleviate symptoms: 1. Local cleansing: Clean the bitten area with normal saline or running water to remove allergenic substances remaining on the skin surface. If itching is severe, wash the area with soapy water, as soap is alkaline and can neutralize the acidic components in mosquito saliva, helping to reduce swelling and relieve itching. 2. Cold compress: Wrap ice cubes in a towel or use a towel soaked in cold water and apply it to the affected area. This helps reduce nerve excitability and constricts blood vessels, thereby alleviating symptoms such as redness, swelling, and stinging. 3. Medication: Apply calamine lotion or anti-allergy ointment to the affected area to ease allergic symptoms. If itching is severe, oral antihistamines may be taken under a doctor's guidance. 4. Avoid scratching: Itching should be managed without excessive scratching to prevent skin damage, inflammation, and potential infection. If allergic symptoms are severe or do not improve, seek medical attention promptly to avoid delaying treatment.