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When the scalp exhibits folds and furrows resembling gyri, it is termed cutis verticis gyrata. The possible etiologies may be categorized as primary essential, primary nonessential, and secondary cutis verticis gyrata. This is based on history, physical examination, and histologic criteria with or without laboratory examinations.

Exogenous localized ochronosis can result from the repeated use of hydroquinone-containing creams, many of which are available over the counter. We report a case that was managed by dermabrasion and CO2 laser. The incidence and proposed etiologies of hydroquinone-induced exogenous ochronosis are reviewed.

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