Why can’t we feel friction between our muscles and skin?

Question

I ask because there’s a mole on my arm that always stays in place despite my muscle contraction right under it.

In: 2

Answer 1

Your muscles aren’t directly connected to your skin, there’s a bunch of intervening tissue layers called “fascia” that keep bundles of stuff together and let different bundles slide past each other.

Things stuck to your skin, like a mole, will stay in position relative to your skin. The muscles can slide relatively freely relative to the skin.