Nephrotic syndrome of minimal change disease following exposure to mercury-containing skin lightening cream: A case report and literature review.

Long-term exposure to mercury-containing skin lightening cream can cause mercury-related nephropathy, among which, membranous nephropathy (MN) and minimal change disease (MCD) are the main pathological types. In contrast to these two conditions, MCD with IgA deposition is not a common disease. In the present study, we report a 65-year-old Asian woman who developed nephrotic syndrome following long-term use of mercury-containing skin lightening cream. The urine mercury level of the patient was significantly increased, and the results of the renal biopsy indicated diagnosis of MCD with IgA deposition. Following three courses of treatment with sodium dimercaptopropane sulfonate (DMPS) alone and discontinuation of the skin cream, the symptoms of the patient were relieved without use of glucocorticoids, with proteinuria turning negative and a significant reduction in urine mercury levels. During the 6-month follow-up period, routine urinalysis remained normal. By reviewing relevant published literature, we summarized the pathological characteristics, possible mechanism of action, and treatment strategies of mercury poisoning-related MCD. The possibility of mercury poisoning should be considered for patients with nephropathy and history of use of skin lightening cosmetics. In these patients, the urine mercury levels should be measured in time so that mercury removal therapy can be implemented early.