It is possible to apply erythromycin ointment to broken skin because the skin surface hosts many bacteria, such as Staphylococcus epidermidis or Streptococcus haemolyticus. If the skin is broken and the barrier function of the epidermis is reduced or lost, the parasitic bacteria invade the skin tissue and cause the corresponding bacterial infection, and applying erythromycin ointment can play a role in preventing and treating the infection. However, if the area of broken skin is large, you also need to take oral amoxicillin capsule or roxithromycin capsule, and you can choose Chinese medicine Wu Wei Disinfection Drink for additional treatment to achieve the effect of clearing heat and detoxification. In conjunction with erythromycin ointment application, you can also apply the Chinese herbal medicine dispel dampness to be spread externally on the affected area.