If a blister breaks, localized pus or localized redness may occur if infection occurs. At this time, you can apply topical antibiotic ointment for anti-infection treatment, usually erythromycin ointment or topical fusidic acid cream can be applied topically. At the same time, attention should be paid to local debridement, and if the pus is obvious, incision and drainage treatment is also required. If there is a significant exudative reaction at the time of infection, topical zinc oxide cream can also be applied, which can provide local astringency. Oral antibiotics are also needed, such as oral roxithromycin or oral cephalexin, which can control the continued development of local inflammation. In addition, while using these medications, you also need to pay attention to the protection of the wound to prevent local contamination and thus cause secondary infection aggravation of the symptoms.