Hi, Omnacortil contains steroid which is used to treat wide variety of medical conditions like severe allergic reactions, asthma, rheumatic disorders, eye disorders, skin and soft tissue, vitiligo etc. It provides relief by preventing the release of substances that cause inflammation and by suppressing the immune system. It is very safe and effective medication if someone uses that according to his doctor s advice. White patches or vitiligo can be come back again after finishing successful treatment. Take care. Hope I have answered your questions. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician