I'm 19 years old, and I had lost some weight (while being underweight) but now am still severely underweight by 22lbs. I'm 5'5 and weight 95-97lbs. I've noticed that around 18, when my weight was dropping, my skin had begun to sag on my forehead. When my hair is down, the forehead shrinks about half the size and feels saggy and not smooth/firm,. This was never an issue before and seems to have happened suddenly. I wanted to know if me being underweight could be the cause, and if so would weight gain help this situation? If weight gain isn't the solution, could I possibly another condition causing this? I'm also experiencing thinning of hair and pale skin.