Itchy under body of men is mostly caused by allergic factors, eczema, fungal infection, etc. It can be treated by using anti-allergic drugs, drugs for eczema, and drugs for anti-fungal infection. 1. Allergy: you can take anti-allergy drugs orally, such as loratadine, cetirizine, etc.; you can also apply anti-allergy ointment locally, such as benadryl ointment and hydrocortisone butyrate cream. 2. Eczema: You can apply ointment for eczema, such as glycerite lotion, zinc oxide ointment, etc. 3. Fungal infections: you can apply topical antifungal drugs, such as miconazole nitrate ointment, fluconazole cream, terbinafine cream and so on. These drugs exist in different degrees of adverse reactions, such as dizziness, drowsiness, skin irritation, etc. In the use of these drugs for treatment, be sure to follow the doctor’s instructions in strict accordance with the doctor’s guidance. There are very many reasons for men to have itching underneath their bodies, and the treatment options are completely different, so if you have any of the above symptoms, please consult a doctor in a regular hospital in a timely manner.