Recently, I've noticed these weird blackish/brown spots on my chest. Here's the thing about them: They come off - either in the shower or just by rubbing them.
I'm wondering where they are coming from - they look almost like mold, to be honest, though I'm assuming that's impossible. It usually happens when I've sweat a decent amount and maybe go a day-plus without a shower. I also sometimes use shampoo on my chest hair, arm pit hair ... is it possible this is just clogged pores? Or oily buildup?
I'm mostly worried it's some weird, serious condition that I need to have looked at.