Small slightly red bump on the middle of my left upper eyelash line. faint pain feels kind of like a sore muscle or bruise, what could it be?

Possibly sty: You may have a sty or blocked oil gland of the eyelash (gland of zeiss) that is secondarily inflamed or infected. Try mod. Hot compresses 2-4 times/day for about 10' followed by gentle massage with duted baby shampoo on a clean washcloth. This should help it resolve in about 7-10 days. If not and persistent or worsening, then an exam is needed to verify the lid lesion.

Bump on eyelid: If it does not go away in a month, or gets worse, see and eye surgeon. Keep warm compresses on it until it goes away, or you go to the doctor.