I am 17 years old, and only just went back from holiday. I stood in the sun for no more than 2 days, but I had no sunscreen protection or hat. I am quite sunburnt and I can guess my scalp is too, but hair at the front of my head(where my quiff is) is visibly less thick at the roots and I can totally remember it wasn't like this before the sun damage. I didn't really see any hair falling out when washing it, and it's quite a short hairstyle too. I'm almost certain that it's all due to the severe sun, what do you think? Is it reversible?
