Could be the cornrows. Watch out for traction alopecia. Or buildup like Coco said. Do you wet your hair at all in between washings? Like cowash or spritz for moisture. My hair has a straight up fit if I go too long without water which in my case is two days.
Low porosity, high density, and fine
4a/3c, mod-CG, itchy prone scalp
Natural 4 Life