Which is stronger - differin or azelex (azelaic acid)?

Differin, (adapalene) but...: Different people have different results, no pun intended. Today, no one needs to have acne. I start people with topical clindamycin; i required 25 years on systemic tetracycline with good results. A dermatologist can write for a retinoic acid derivative that's very powerful even for the toughest cases. Good luck.