When the patient is bitten by fleas, the general symptom manifests itself in the appearance of small red pimples, the texture is relatively hard, the middle part of the pimples can be seen in the bite, accompanied by intense itching sensation. Patients can be treated with medication under the guidance of a doctor. Fleas are creatures with long hind legs and strong jumping ability. When the patient was bitten by the flea after the skin lesions are also known as insect bite dermatitis, clinical symptoms in the lesions appear red hard pimples, pimples can be seen in the center of the bite of the size of a needle tip, and accompanied by a strong itching sensation. The more the lesions are scratched, the more pronounced the itching, and the redder and harder the lesions become. For treatment, patients can use topical glucocorticoid drugs, such as mometasone furoate ointment, hydrocortisone butyrate ointment and so on. When the patient is bitten by fleas, it is recommended to go to the regular hospital for examination in a timely manner, under the guidance of a professional doctor for medication.