Photo-Induced Sarcoidosis in a Diabetic Patient Receiving Metformin Hydrochloride

This case highlights metformin as a potential photosensitizing agent in cutaneous sarcoidosis. While the relationship between diabetes mellitus and sarcoidosis remains unclear, chronic inflammation in diabetes may influence sarcoidosis progression. In cases of refractory cutaneous sarcoidosis despite systemic steroid treatment, it is crucial to consider the coexistence of photosensitivity, particularly drug-induced photosensitivity. Therefore, carefully reviewing the patient's medication history is essential for accurate diagnosis and management.