Hydroxychloroquine has been studied as a potential treatment for chronic inflammatory conditions of the skin and mucous membranes, such as lichen planus and pemphigoid. hydroxychloroquine sulfate tablet 200 mg Its immunomodulatory effects may help reduce inflammation and improve skin and mucosal lesions in some patients. However, evidence supporting the use of hydroxychloroquine in skin and mucous membrane diseases is limited, and further research is needed to determine its efficacy and safety.