I havent had problems in the past with acne....now that I am 64, I have acne on the butt cheeks. I went to see a dermatologist after seeing scars on my cheeks with a mirror......he gave me clindamycin phosphate gel to use and sulfamethoxazolee-TMP DS,,,,I dont mind sharing with you that it is painful, unsightly, etc. I work for GP and she had put on an antibiotic, didnt work.....this medicine that the dermatologist wrote the script worked but it took a long time for it to finally take effect. Now, it is back and so painful, I can hardly sit........what do you suggest? (BTW, I have read about personal hygiene and I can safely say I think I do okay........