"i&#039;ve been using the &#039;differin&#039; adapalene gel for around 3 years.  i used to have pretty severe acne when i was around 17/18. i started using the gel alongside tetracyline anti biotic tablets and within a few months my skin had completely cleared up and marks had started to disappear. i&#039;m now 22 and i haven&#039;t needed to use it for around 6 months."