I’ve noticed that when I pull my eyelashes they’ve grown back thicker and darker as if I’m wearing mascara… if that helps

Yes, I have obnoxiously coarse hairs on the cowlick on the crown of my head from repeated pulling

Yup Mines starting to be gray@!!!

It’s a common thing. I have family that are in cosmetology and they have told me it’s normal. Especially as we age for hair to change in coarseness or color. It’s not necessarily linked to pulling it out. What is effected by pulling your hair is the hair follicle which effects HOW the hair grows, IF it will grow back, and it also can damage the to the scalp and hair shaft.