Weird Rashes?

Sorry if this is the wrong place to put this, I just chose this over life because i'm searching for advice >m<

I've been getting strange rashes on my elbow and back of my hands. I had recently done some photo developing for a class but the rashes appeared to have still popped up even after I stopped working in the dark room.

I was wondering if they might be stress related? I can't think of any possible explanation besides that but I would love to hear some ideas. I'm going to put some excema cream or whatever on them later.

Thank You.