The testicles and inner thighs are both part of the perineum, and the area may experience symptoms such as redness or itching due to repeated contact with moisture, irritation, and friction. This is because the local environment can easily lead to fungal infections, which can lead to the formation of ringworm. It is also possible that there is no fungal infection, but only simple dermatitis caused by frictional irritation, with symptoms of itching. For the treatment of ringworm, you can choose to take oral antifungal medications, such as terbinafine hydrochloride tablets, with sertaconazole nitrate cream. For cases without fungal infection, pay attention to keeping the area dry, pay attention to ventilation, and in more serious cases, you can apply topical zinc oxide ointment borate to play an astringent and anti-inflammatory role.