All Over Body Rash THat Looks Like Measles But Isn't.

All over body rash tHat looks like measles but isn't. jUst had 6 day steroid pack but the mottled redness while somewhat less is still there. It seems like inflamed blood vessels by the pattern of it. I am in good health otherwise. No fever, no pain, tho the area on my back feels sensitive. What could this be?