I had this weird bump 5 years ago, I just woke up and this appeared. It was red then and after a few days(I didn't touch it) it turned into my skin tone, like light brown skin tone. So when I touch it or accidentally touched it, it will turn red, not painful but just red and then for a few days not touching it, it will turn to dark red, then next day black, then next day light red/pink, then the next day it will turn to my skin tone again
click the "about" section, I put description on them about this bump.
ps. don't mind my hairy face