[s1artibartfast]

You can see a digram of the blood supply here [1]. If you look at this paper, you will find several warts with black dots. Those are blood vessels which have reached the surface.[2]

https://sanderspodiatry.com.au/blog/2021/02/23/plantar-warts...

https://www.dovepress.com/dermoscopy-features-of-cutaneous-w...