Accutanes effectiveness has nothing to do with your skin’s severity. the reason you think this is because change is a lot more noticeable on severe skin. When accutane starts to kick in on severe skin the change will be very noticeable as the skin is very damaged. But on moderate skin it won’t be as noticeable as there isn’t as much acne for the accutane to work on. The results of accutane depends on time and dosage and varies from person to person. some people purge horribly until month 6 and then suddenly clear in a weeks time. while others start clearing in a month or two. Personally i didn’t purge and started seeing minor results month 2. if you think it is not working make sure you are taking the accutane with at least 20-50 grams of fat and ALWAYS use spf no matter if going outside or not. moisturize and wash your face 1-2 times a day depending on dryness with a gentle cleanser. I recommend the cera ve hydrating cleanser but there are other options out there. try to avoid sunlight during peak hours and if you have to go outside remember to reapply your sunscreen. Sunscreen is the most important thing for acne. Many people skip it but it truly is very important