I'm coming up with rashes in different places that come and go, have not eaten or come in contact with anything out of the ordinary. why is this?

Such rashes: are called "EVANESCENT" rashes! They are associatede for the most part with INFECTIOUS (usually VIRAL) or ALLERGIC/IMMUNOLOGIC disorders Start with your PCP who can SCREEN you for various causes ...If you see a DERMATOLOGIST MAKE SURE you HAVE the rash when you see him/her! Hope this helps! DR Z

Can't say: This rash would likely need to be examined and more history obtained to be able to provide you with useful input about the diagnosis or possible treatment.