Itching at the roots of the thighs in men is considered as follows.1. Ringworm, due to the stifling heat and humidity at the roots of the thighs, and if the patient is in an obese state, it can cause a lot of sweating, which can easily breed the production of fungi. If there are patches of annular erythema with raised edges, it can be judged to be this type of disease to the naked eye. usually, laboratory tests are needed to further confirm, and if confirmed, compound snake fat ointment 1:1 with and terbinafine hydrochloride gel can be applied twice a day for treatment. severe cases can also be treated with oral itraconazole capsules for large rashes with intense itching. 2. consider eczema. It is mainly caused by allergies and may be due to wearing chemical fiber liners or underwear.