Potassium permanganate solution is generally used clinically to rinse or soak lesions that become infected, and afterwards it is possible to use erythromycin ointment to treat or prevent infection. So the two can also be used together, but need to be under the guidance of a doctor. 1. Potassium permanganate lotion: Potassium permanganate is a strong oxidizing agent, based on different concentrations of the preparation of the lotion, clinically it has the role of sterilization, anti-inflammatory, analgesic, antipruritic and so on. It is used for the treatment of dermatitis eczema secondary infection, ulcers secondary infection and so on. 2. Erythromycin Ointment: Erythromycin Ointment is mainly composed of erythromycin, excipients for petroleum jelly, paraffin, etc., belonging to macrolide antibiotics. It is mainly used for the treatment of purulent skin diseases and ulcer surface infections. The above drugs, it is recommended to use under the guidance of a physician.