Definitely could be a reaction to something. Have you changed detergents, water filtration system, soaps, moisturizers, anything new? When you get a sudden reaction like that, it usually can be tied into something that has had contact with your skin that it does not like.

A friend had a similar issue, go to a pharmacy and they'll give you a few creams that will tone the rash down. It's most likely a sort of allergic reaction.