Betamethasone | Gentamicin and Miconazole| which treats skin infections. Betamethasone is a steroid which blocks the production of certain chemical messengers (prostaglandins) that make the skin red| swollen and itchy. Gentamicin is an antibiotic which stops the growth of bacteria while Miconazole is an antifungal which stops the growth of fungi on the skin. Together| they treat your skin infection effectively.