For about 2 weeks I have had these tiny to small bumps that first sting like fire around the bends of my arms starting with the right and then went to the left. It stings really bad and then itches, eventually coming to a head and then a small light yellow colored core comes out leaving a red blister looking spot that burns. They are always within 4-5 inches of the crook of my arm. Can anyone tell me what this is? Someone told me it looks like Agent Orange. Corticosteroid cream seems to work well on it, but it just breaks out in another spot. It always seems to happen after being outside.