What Causes Burning Mouth Syndrome With Body Wide Rashes?

I have the symptoms of burning mouth syndrome but along with that there ve been some other changes I ve never had to face before such as I m getting rashes on different parts of my hands,behind my ears My skin splits easily on my thumbs also I on my Big toe of my right leg my nailbed has suddenly started to go purple and it appears to be lifting from the white moon it just doesn t make any sense to me why these things happen