Recurring boils and similar large, painful pimples
After age 21 I had terrible huge pimples. When my pharmacist told me that some derms prescribed Vitamin A, I started on it immediately.. It was like a miracle, a moderate miracle. The huge deep pimples stopped and my skin improved in other ways.
I used to take 50,000 units a day but now I would limit myself to 25,000 units per day. Just be patient and don't stop the treatment.