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This study highlights that smoker's mustache, a tobacco-related hair discoloration on the upper lip, is asymptomatic, generally unnoticed, and may resolve if smoking is discontinued, though patients often continue smoking.

This review discusses yellow hair discoloration associated with smoking and systemic conditions, proposing smoking cessation or hair removal as management options, but provides no new clinical results.

This study demonstrated that a strain of lactic acid bacteria from kimchi, identified as Pediococcus inopinatus, showed antibacterial activity against certain oral pathogens and effectively bleached stained artificial teeth and inhibited biofilm formation, offering potential for addressing teeth discoloration and halitosis.

In this case report, a 46-year-old man developed scalp necrosis with infection following FUE hair transplantation, possibly due to factors like smoking, long surgery duration, dense grafting, and secondary infection. Early recognition and treatment prevented further tissue loss, but the patient had residual scarring.

This report describes a case of acquired yellow hair discoloration in a 77-year-old woman, potentially caused by applying selenium sulfide after bacitracin zinc to her scalp.