Patients with mosquito bun-like bumps can be caused by a variety of different diseases, but at present the following clinical conditions: 1, insect bite dermatitis: this disease is a common allergic dermatosis in children and adolescents, usually due to insect bites and its heterogeneous protein can cause the patient’s local skin surface wind-like lesions, and then the formation of mosquito bun-like bumps. The bumps often appear in batches, usually in the patient’s waist, back and extremities, surrounded by a fusiform red halo, and can be accompanied by pruritus, scratching easier to erosion and secondary infection; 2, urticaria: this disease is more common in clinical practice, usually due to patients eat or inhale allergens, mechanical stimulation and other causes of skin, mucous membrane small vasodilatation or increased permeability and then limited edema reaction, specifically can be manifested as mosquitoes The bumps may appear as mosquito-like bumps, accompanied by itchy skin, and a few patients may develop edematous erythema. This disease more in 2-24 hours to subside, but the condition is often repeated, so the course of the disease can be prolonged for several days to months; 3, nodular itchy rash: this disease is a chronic inflammatory skin disease can be long-term, and most of the women. The patient’s lesions tend to occur on the extremities, especially on the extensor side of the calf and the number varies, sometimes in strips, and characterized by intense itching and nodular damage, so it can appear like mosquito bumps itchy symptoms.