There are many causes of itchy skin on the inner thighs, the common ones are ringworm, eczema, contact dermatitis, scabies and so on. 1. Ringworm: Fungal infection caused by ringworm, can cause groin, perineum, buttocks and other skin, ring-shaped erythema, itching, may lead to itchy skin on the inner thighs. 2. Eczema: Inflammatory skin reactions caused by internal and external stimuli can also cause itchy inner thigh skin. 3. Contact dermatitis: allergic or irritant reactions after contact with certain sensitizing or irritating substances can also lead to itchy skin on the inner thighs. 4. Scabies: The contagious skin disease caused by scabies mites parasitizing the skin may also cause itchy inner thigh skin. Itchy skin on the inner thighs, there may be other reasons, you need to go to the hospital in time to check and clarify the cause of the disease.