Carbon dioxide laser treatment of periungual and subungual viral warts.

This is a retrospective study of the cure rates of forty patients with subungual and periungual viral warts treated with carbon dioxide laser vapourisation (total of 69 lesions). 70.6% (48/68) lesions had failed treatment with cryotherapy and/or electrocautery treatment previously. 20/68 were treated with CO2 laser vapourisation as a first line treatment. The overall cure rate over 10 months follow-up period was 57.4% (39/68). Most recurrences (24/25) occurred within the first 3 months of vapourisation. The carbon dioxide laser vapourisation cure rate for warts in which previous cryotherapy and/or electrocautery had failed was 47.9% whereas those treated with carbon dioxide laser vapourisation as a first line treatment had a cure rate of 80% (p = 0.043). Subungual warts responded slightly better with a cure rate of 64.7% compared with periungual warts (54.9%) (n.s.). The carbon dioxide laser vapourisation cure rate for recurrent subungual and periungual warts (which failed previous carbon dioxide laser vapourisation) was 73.3% (11/15). Our findings appeared to indicate that periungual and subungual warts can be eradicated by CO2 laser vapourisation. Recurrent warts can be effectively eradicated by further vapourisation. Recalcitrant periungual and subungual warts which have previously failed to respond to cryotherapy and/or electrocautery can be effectively eradicated with CO2 laser vapourisation.