[seabass-labrax]

Thanks for responding! Maybe I have had a verruca on my thumb, then: for many years I had a dark bump on the pad of my thumb, which was painful to touch, and then it appeared to 'sink' into the skin. I don't suppose there is any reason why one's (healthy) skin cells wouldn't cover over the wart given an opportunity, and maybe the continual pressure on my thumb gave it just that.

[s1artibartfast]

>I don't suppose there is any reason why one's (healthy) skin cells wouldn't cover over the wart given an opportunity, and maybe the continual pressure on my thumb gave it just that.

I suspect what you were seeing was not it sinking in, but reducing in diameter, as your immune system consumed viral cells. Imagine the cross section of a cone decreasing as it is pushed out of a surface.

[denton-scratch]

I'm not a doctor.

1. Veruccas are warts on the soles of the feet. If it's on your hand, it's a wart.

2. Warts are normally skin-coloured, or greyish, or yellowish.

See a doctor.

[Edit] I think some people refer to some kinds of mole as a "wart". If your lesion is dark, then maybe it's no kind of wart at all, but a mole, i.e. a melanoma.