Erythromycin ointment can be applied to the private parts, which is an antibiotic ointment commonly used for the treatment and prevention of skin infections, and is effective in treating minor itching, although it needs to be used under the guidance of a doctor to avoid using the wrong medicine. It is important to wash your private parts before use, then apply the ointment evenly to the affected area and keep it ventilated for a certain period of time after use.