Cut the surface layer to see if there is granulation tissue inside, which may be boils. Tretinoin cream can be used. I used it. I use ointment before going to bed, and then wrap the boils with plastic film. I'll take it off after dawn and it will take effect in a few days. If the film does not affect my life and work, I can extend the use time.

Of course, it is still recommended to go to the hospital for dermatological treatment.