When I was at school in Malawi we used to 'treat' cutaneous warts
by briefly focussing the sun into the base of the lesion with a
magnifying glass. This would produced an itching hyperaemic
reaction after a few days and usually caused the lesion to
disappear within a few weeks without scarring.
Anecdotal perhaps, but certainly a simpler and cheaper solution
than photodynamic therapy or pulsed dye lasers, though it does
require a climate which is sunnier than Britain.
Competing interests: No competing interests