Male subcoronary groove redness and itching may be due to glans, syphilis, contact dermatitis and other diseases, need to apply miconazole, betamethasone, benzylpenicillin, loratadine, halometasone and other drugs for the cause of the disease. 1. Glans: common symptoms include erythema, edema, itching and pain in the skin around the glans. If it is candida glans, patients need to follow the doctor’s instructions to apply miconazole, clotrimazole and other antifungal drugs. If it is caused by aerobic bacterial infection, you need to follow the doctor’s instructions to apply betamethasone, erythromycin, clavulanic acid and other antibiotic drugs. 2. Syphilis: Mostly considered to be the manifestation of syphilis rash in the second stage of syphilis, that is to say, there are itching, red or reddish-brown papules and other symptoms of the skin at the genitals. Patients need to follow the doctor’s instructions to apply benzylpenicillin, procaine aqueous penicillin G and other penicillin drugs. If you are allergic to penicillin, you can apply ceftriaxone, doxycycline and other antibiotics as prescribed by the doctor. 3. Contact dermatitis: the main manifestation of the contact area there is itching, erythema, mild edema and other symptoms. Patients need to follow the doctor’s instructions to apply loratadine, cetirizine and other antihistamines, halometasone, prednisolone and other glucocorticoid drugs. Causes of male subcoronary groove redness and itching more reasons, need to go to the hospital, clear cause, with doctors actively treat the original disease.