Pus under a scab is usually not likely to grow back on its own, and if there is pus under a scab, aggressive antimicrobial treatment may be necessary. First, the scab is removed, and after removal, the wound is re-cleared so that the pus has no place to hide, so that normal growth of the skin wound can be easily restored. Generally after using surgical treatment, oral antibiotics are needed, you can take oral roxithromycin, or cefprozil, or cefixime, etc. are possible, and at the same time, pay attention to local disinfection and hygiene.