"i tried a lot of things for my acne and none of them had worked before differin gel. it&#039;s irritating to have acne at 34 years old. i didn&#039;t think anything would help. differin gel was affordable and i could get it at walmart so i tried it and was pleasantly surprised. this is the first thing that worked for me. you only need a very small amount and you only need to apply it once a day. any more than that and it will burn your skin. it&#039;s a small tube but but it lasts a long time. i would highly recommend it."