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Treatment of Acanthosis Nigricans of the Axillae Using a Long‐Pulsed (5‐msec) Alexandrite Laser

BACKGROUND Acanthosis nigricans of the axillae is a common cutaneous disorder that is difficult to treat. OBJECTIVE The objective was to assess the efficacy and safety of a long-pulsed alexandrite laser (5 msec) in the treatment of acanthosis nigricans of the axillae. METHODS A single axilla was treated using the long-pulsed alexandrite laser. Ten sessions were required, at fluences of 16 to 23 J/cm2 using either 10- or 12.5-mm spot sizes. The untreated axilla served as a control. RESULTS Greater than 95% clearance was achieved after seven sessions. There was no recurrence after 2 years. The untreated axilla was unchanged. CONCLUSIONS The long-pulsed alexandrite laser can effectively and safely treat acanthosis nigricans of the axillae.