Can Accutane clear pigmentation from acne (dark patchy spots) on the arms?

Thank you for your question.
Accutane is FDA approved to treat severe cystic acne. There are alternative treatment options that are effective in treating dark spots such as topical lightening agents, laser treatments, chemical peels, etc. I highly recommend you consult with a board certified dermatologist to have your skin evaluated and to discuss treatment options that best suit your needs. Take care and good luck.