The itchy inner thighs are caused by the following reasons: 1. Newly bought pants and underwear are not washed and put on directly in contact with the skin, resulting in skin allergies that cause itchy, rice-like bumps on the inner thighs and the entire leg. 2. Obese people, when the skin on the inner thighs is rubbed when walking, the local skin blood circulation is accelerated and the symptoms of itchiness appear. The symptoms can disappear with proper exercise, diet control, and keeping weight within normal limits.3. Patients who usually sweat a lot at the root of the legs, leaving the local skin in a damp state for a long time, cause the local skin superficial layer of fungi to grow and form ringworm, and patients who have itchy inner thigh skin, in addition to rough, flaky skin, rub the affected area with clotrimazole ointment or ketoconazole ointment.4. Patients whose local skin has been bitten by mosquitoes or infected by scabies mites can also develop it. Do not blindly treat yourself with medication at home, it is best to go to the hospital dermatology examination to confirm the diagnosis and find the cause of the disease after symptomatic treatment.