I hav been trying clindamycin on my acne for 3months now but its not working what should i do next im 17 please help?

Next step: If Clindamycin plus benzoyl peroxide has not worked, the next step may be a trial of the oral contraceptive pill if it is right for you, or a systemic antibiotic that's appropriate for you. Good luck. For the tough cases, you may consider accutane; it carries some risks but is worth it for rough disease. Your physician can determine if you have excess androgens as part of the problem. Good luck.