Therapeutic options include photodynamic therapy (with combined use of 5-aminolevulinic acid
and visible light), cryotherapy (liquid nitrogen), cauterization,
laser treatment (eg, with argon, carbon dioxide, or pulsed-dye laser) and excision. Complications of these nonspecific destructive therapies include scarring or transient dyspigmentation.
ref:http://www.emedicine.com/derm/topic395.