How to reduce swelling from a mosquito bite?

My 22 month old son is allergic to mosquitos and was bite on the hand. His hand has been swollen for about 3 days. I have put some prescribed ointment on his hand and the bump mark is going away but the swelling still exist. What can I do?

Rub the inside of banana peel

Put an ice pack on the bite area. You can also apply calamine lotion for soothing effect.

Rub onion directly on the bite area. it is powerful antioxidant treatment.