“…15,16 Treatment of Viral Warts Therapy of recalcitrant warts was performed using the allergic contact sensitizers dinitrochlorobenzene, diphencyprone, and squaric acid dibutyl ester. Clearance rates were 69% to 91% for dinitrochlorobenzene, 17,18 62% to 88% for diphencyprone, 5,19 and 11% to 86% for squaric acid dibutyl ester. 20,21 Similar results have been reported in a retrospective study of 61 children, where a 58% complete clearance was achieved with squaric acid dibutyl ester after a mean duration of therapy of 7 weeks.…”