Last week I was wiping expo markers off alot of work sheets and the rag that I was using had so much expo marker on it that my hand turned blue. Later that night I noticed on half of the top of both of my hands was a darker skin color, it was a bit itchy but I just tried to avoid itching it. I put cortazone and took benadryl and have been doing so for the past week but it s not going away. If there is any way to send a picture to you if you think you may know what it is and how I could get rid of it is greatly appreciated. My doctor thinks it s irritant contact dermatitis but I haven t found picture that looked like mine. It s not bumps. It just looks like I got a tan on half of both of my hands