Cleocin T (Clindamycin) is used to treat acne. It helps to decrease the number of acne lesions. Clindamycin is an antibiotic which works by stopping the growth of bacteria. Clindamycin is used to treat a wide variety of bacterial infections. It is an antibiotic that works by stopping the growth of bacteria. This antibiotic treats only bacterial infections. It will not work for virus infections (e.g., common cold, flu).