“…The strength of bleomycin used has usually been 1 U mL À1 , equivalent to 1 mg mL À1 , but weaker strengths of 0Á5 mg mL À1 or even 0Á1 mg mL À1 seem to produce similar effects. 100,101 The introduction of bleomycin into the skin is painful, and local anaesthesia, either before or together with administration of bleomycin, helps to make the procedure more comfortable. The effect of bleomycin on the wart produces some pain that lasts a day or two, and then necrosis develops with a black eschar that separates after a few days.…”