Hello,
The treatment of choice for steven johnson’s syndrome is corticosteroids and you are already using topical steroids. Other than that, take some antihistaminic and apply calamine lotion on the rash. Also wear cotton undergarments. Avoid masturbation for some day and oral antiinflammatories like ibuprofen/acetaminophen are also helpful. If the symptoms are severe then it will be best to consult a dermatologist.
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.