Hello doctor, I am 19 years old, male, recently I have discovered that my crown hair is slightly thinning, however I think it is a cowlick, because the middle part of the crown where the swirl is thick but away from the swirl it is thinner. You can actually see my scalp lines or hairlines. You can see my top back hairline and side of the crown hairline.
Hi.  I can see thinning of hair in the picture you have attached, but I cannot see the hair line (attachment removed to protect patient identity). It could be telogen effluvium (stress induced) or early androgenetic alopecia or visibility of scalp could be because of your short hair. Androgenetic alopecia or male pattern baldness starts with receding hair line on the temporal and frontal area of scalp then there will be thinning in the crown of scalp. I will have to see pictures taken from the front to visualize hair line receding to confirm androgenetic alopecia. Are you actively losing hairs everyday? Do you see more hairs while taking shower? Do you have family history of baldness? Any history of illness in the recent past? Any surgeries? Hospitalization? Hair needs protein for growth, diet rich in protein say 40 to 60 g of protein per day is very helpful. It depends on the body weight. Avoid hot water, use lukewarm water to wash scalp.