I'm 17 and I used to feel a bit of itchiness in my scalp and so, when I'd itch it I'd find somethings that are a bit like sand and white and usually 2 or 3 hairs would also fall off in my hand, after a while I started feeling like those areas are a bit empty. I have curly hair and usually when i brush it I don't really see those spots, the pictures are of my hair while it's unbrushed. Also, 3 years ago i used to take acne medication which damaged my hair, I also used acne ointment called adapalene which I noticed caused hairfall in my right temple