| | Conditions & Treatments | Multiple Sclerosis How long does Steven Johnson syndrome last? Steven-Johnson syndrome (SJS) typically lasts 2-4 weeks. However, it can take longer for the skin to fully heal, and some people may experience ongoing complications. Multiple Sclerosis - Related Articles What Are Gadolinium Enhancing Lesions? MS Symptoms & Stories Alternative Treatments for MS Is optic neuritis related to multiple sclerosis? Side Effects of Baclofen How do you cure mild sclerosis? Diagnosis of Rheumatoid Arthritis & MS