Welcome back SIDI…
I don’t know…you never know, I used to get these gray stains on the top of my shirt….turns out it was from all the mousse in my hair (not chocalate, or the animal, yes there is something called hair mousse) that I put so my curls would stop being so frizzy (puffy….I don’t know how to explain frizz to men)
I switched hair products and always dry my hair or put a towel on my shirt till it dries…
You really never know what the problem could be…