You could have worsening acne at 3 to 6 months into procedure, but This is certainly regular. Continue on applying the medication prescribed. You need to see an improvement soon after six to 12 weeks of use.Tr??c khi thoa Tretinoin, b?n nên r?a m?t, t?y trang th?t s?ch s? và tuy?t ??i không làm quá m?nh khi?n da b? tr?y x??c, t?n th??ngTretino