Itchy bumps on legs are considered to be related to insect bite reaction, contact dermatitis, urticaria, scabies or other diseases. 1. Insect bite reaction: mosquito bites the skin on the legs caused by insect bite reaction, can cause some patients to have small bumps on the legs itchy phenomenon. The patient’s legs may also appear fusiform bright red doughnut-like damage, may also show edema, erythema, blisters and other symptoms. 2. Contact dermatitis: contact dermatitis is caused by skin contact with exogenous substances, such as caterpillars, flowers, daily necessities. The disease will cause patients with local skin erythema, edema, papules, blisters and skin itching, burning pain, etc., so some patients may be manifested as itchy bumps on the legs. 3. Urticaria: urticaria is related to allergies, infections, autoimmune factors, patients often manifested as the size and shape of the wind, angioedema, easily accompanied by itching. Therefore, some patients with urticaria will have small bumps on the legs itchy phenomenon. 4. Scabies: Scabies is a disease caused by scabies mite parasites in the skin, which can cause some patients to have itchy bumps on the legs. Scabies is mainly manifested as pimples, the skin may also appear small, raised, gray or light black lines, pimples may also have small blisters at the top, intense itching. 5. Other diseases: eczema, psoriasis, ringworm and other diseases may cause itchy bumps on the legs. It is recommended that people with itchy bumps on the legs consult a doctor for examination, and follow the doctor’s instructions for treatment after clarifying the cause of the disease. Daily attention to skin care, to avoid friction stimulation of foreign objects, itching should not be scratched.