The red knot that is bitten by bug on leg is very itchy how to do

The red rash on the leg that is bitten by insects is itchy. This phenomenon may be caused by insect bite dermatitis. It is also clinically called papular urticaria. It usually presents as red inflammatory papules of needle size to spindle size, accompanied by intense itching. This phenomenon can be treated with oral anti-allergic drugs such as cetirizine hydrochloride and loratadine. It also needs to be treated with topical drugs such as calamine lotion. If the skin reaction is serious, such as blisters or even bullae on the front of the calf, you need to see a doctor at this time.