Hi I got a very sudden rash, itchy as hell. It is on my right arm starting 1/2 way between my elbow and ending almost at the base of my shoulder. It started as little tiny bumps and was very itchy. I looked for a bite and could not see one so I proceeded to put on Cortisone and the itching. In about 1/2 hr the redness stared to go away and is much smaller now. When I touch the redness the heat is much greater than my other arm. My eyes were feeling like I had little bits of sand in them, which I usually get if I am in contact with a cat or when I have dry eyes. I used my eye drops to no avail, so I proceeded to take one benydryl. In about an hour the eyes felt a little better, sandy feeling gone, but very tight feeling and red and teary. Help. I hope my rash is not shingles.