I don't have these now, but I think I did have one when I was a kid in the early 80s. At the time I didn't know what they were. I remember getting a flat, disc shaped grey mark on the instep of my sole. At the time I was in swimming lessons. After my mom noticed, we went the doctor for an examination, and he prescribed some thick, evil smelling liquid from a small bottle with a glass probe on the lid, which my mom would use to paint the top of the lesion. Then she would cover it with cream and put a tape bandage on it. The liquid and cream wouldn't hurt, but then I remember when the 'cap' came off. She peeled off the bandage one day, and instead of the normal surface, there was a cavity with a bunch of tiny stalks inside, almost like the surface of your tongue, only white. I remember it so vividly because when my mom put the liquid on, it was like somone was jabbing white hot needles in my foot. I was researching another illness, when I rembered my childhood experience and went looking for the information. I figured out that it was probably a plantar wart, but does anyone know where I can find a picture of the top of one that's open? All I've seen online are closed, and look more like callouses and corns than what I remember.