I am 20 year old girl turning 21in a month with moderate acne. I am about 158 cm tall and weigh 54 kg. My dermatologist told me that 20 mg is most likely enough for me and that I don't need to reach 120mg/kg. This is my first day taking 20 mg. She said that new researches show it's not necessairy. But I am worried that it will not work for persitent acne or that I will relapse. Can I have an opinion on this?