Mosquito bites ulcers do not heal need timely medical examination, symptomatic treatment, you can use topical drugs or oral medication. 1. topical drugs: mosquito bites ulcers do not heal considered to be scratching the skin breakage, you can generally use 3% boric acid solution wet compresses, you can also use saline soaked sterile gauze wet compresses, can relieve the symptoms of ulcers do not heal. 2. Oral medication: this situation can be treated with oral medication, such as oral loratadine, cephalosporin antibiotics, etc., can play the effect of anti-itch and anti-infection. Usually need to observe the skin recovery, it is best not to scratch, so as not to lead to the aggravation of the symptoms of infection. It is recommended to consult the dermatology department of the hospital when the above situation occurs, and the above drugs should be used under the guidance of a doctor.