question: Is it possible to be allergic to a brand new mattress with a euro top (has memory foam) in the form of a non itchy rash? I got a rash over my body (non itchy) and the only thing that has changed is a new mattress. I have a mattress cover on top and a sheet so there is no direct contact. Could the mattress possibly be the problem? The mattress is a Sealy Optimum.