Got under foot the tincture of my dermatologist for my Dornwarze. Tincture is the best and only one that has helped it. Please use regularly, the spike grows slowly out. But it has helped !! Had previously tried other things, but this has not helped. The cut out at another dermatologist has not helped, because if it bleeds, it gets worse. So always Duofilm brushing, previously easily rub off the skin with a file. Slowly the black thorn grows out. Much patience and success!