Usual Rash at Bend of Elbows

I've developed this strange rash after sleeping in different bedsheets. I'm assuming it's either that, or possibly from accidental contact with poison ivy the same night when I was enjoying a bonfire. I've had this for about three weeks I think?

I'm not sure what it is. At first I thought it was just a bad reaction to mosquito bites. I have a hard time resisting the itch now. It's so itchy... It's driving me crazy. It's very distracting, and I'm worried it could get worse. I don't know how to make the itching stop or what to take to get rid of it.

I'd really appreciate it if anyone could suggest what it might be, but really I just want an itch remedy. Pretty sure it'll go away if I don't mess with it, but the urge to itch is strong within me!

left arm and right arm