The yellow blisters after a child is bitten by a mosquito is the toxin into the skin caused by the metamorphosis caused by the use of topical drugs, including corticosteroid preparations, can also use oral medication. The yellow blisters that appear after a child is bitten by a mosquito are usually insect bite dermatitis, which can be treated with topical medications. These include corticosteroid preparations such as 0.05% Denard cream and hydrocortisone butyrate cream. If the skin lesions are broken with much secretion, povidone-iodine solution can be used as a local wet compress. Erythromycin ointment and mupirocin ointment can be used when localized infection occurs. In addition, if the symptoms of itching are serious, you can take oral antihistamines, such as loratadine, cetirizine and other relief, if necessary, short-term oral prednisone and other hormone therapy. If the symptoms of insect bite dermatitis are serious, you should go to the hospital in time, and use the above drugs should follow the doctor’s instructions.