Hello,
Weight loss is one of the side effects of taking Accutane and it may cause anorexia as well. Eat a healthy nutritious diet and consult your doctor if weight loss is a major problem. You may need to be put on some other medication for acne rather than Accutane.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.