Round red spots on thighs without pain or itching may be caused by sweat irritation, allergic purpura, psoriasis and other diseases, which can be treated by applying drugs.
1. Sweat irritation: If patients are in a humid environment for a long time, producing more sweat, and cannot remove the sweat in time, it may lead to round erythema on thighs without pain or itching. This situation should keep the clothes clean, change clothes, wash the skin, do not wear wet clothes again.
2. Anaphylactic purpura: It is a kind of allergic inflammation, often caused by the dysfunction of autoimmune system, often manifested as reddish-purple ecchymosis on the surface of the skin, which is painless and itchy, and may be accompanied by symptoms such as swollen and painful joints and abdominal pain. After clear diagnosis, patients can take oral prednisone, leflunomide and other drugs as prescribed by the doctor.
3. Psoriasis: the specific cause of psoriasis is not clear, may be related to genetic factors, immune function, etc., often manifested as a clear border of red spots, papules, plaques, etc., covered with silvery-white scales, the initial period is not accompanied by itching, pain symptoms. After clear diagnosis, patients can follow the doctor’s instructions to take oral avitamin A, topical carbotriol and other drugs.
Round red spots on the thighs do not hurt and itch, but may also be caused by other diseases, it is recommended to go to the regular hospital dermatology department in time to check, follow the doctor’s instructions standardized treatment.