I have a depression since like 7 months (maybe more) and since a few weeks my friends noticed very profounds marks in my back.
And it's strange because I haven't had any noticeable weight change in the last few months or any growth spurt. 
I'm eating less and I may have lost a little weight but I've always been skinny even without depression.
Does this have anything to do with hormones? I can't find any answers on the internet.

Also I'm a boy if it can help answering the question.
Thanks !