hello... I have developed a strange skin rash that I've never had before. It's itchy at times, it comes and goes and its in completely random places on my body. These patches don't itch all the time but when they do it's for a few minutes, a strange welt will appear, swell, and then stop itching. Once the itching goes away, the swelling goes away and i'm left with redness and the welt becomes only slighty raised up. Not nearly as puffy as it becomes when it starts to itch, however, still raised slightly and redness. can you please help me?