Are the backgrounds of these photos natural fibers and human skin?

Do the beetles show an affinity for these surfaces?

Dermestid beetles would be a possibility in that case.

Note that it is the thorax of your beetles, not the head, that is the lighter color.

The head and antennae are not visible in the images.

Try for better pictures.

Dermestid beetles are an indoor pest.

Thanks for the reply. Yes, first image on my sock and second on my leg. I wish I could get a better picture. They're tiny and that's the best I can get.