Do you ever wonder what those black dots are on warts? They are dots of dried blood! Not seeds. When HPV (human papilloma virus) makes warts, it sends signals to create large capillary loops that reach close to the surface of the wart, which lends itself to easy bleeding. These capillaries feed the wart, so by doing things to decrease the capillaries (e.g. burning, freezing), it can help get rid of the wart.