It could be a bacterial infection. It is best to consult a doctor or a dermatologist who will prescribe either topical remedy or other treatments such as excision and antivirals depending on the diagnosis.

I don't want to worry you but it can be herpes.Herpes is a viral disease that's contagious and caused by the HSV (herpes simplex virus). Once you've been infected by this virus, then your skin will experience blisters and sores so around your mouth area, buttocks, nose and genitals. Even though it's a generally mild illness, it's bothersome since these blisters are painful, itchy and occasionally invisibly.