Erythromycin is an oily substance that can moisturize and maintain skin moisture, especially in winter and spring when the skin is prone to dehydration; on the other hand, erythromycin has antibacterial and anti-infective effects. If you have a history of localized acne or skin breakdown infection, applying erythromycin to the face can also inhibit bacterial infection more effectively, and also have the effect of preventing bacterial infection. In addition, erythromycin has other effects, such as softening keratin and preventing flaking.