every summer I have a rash that appears on my arms between my wrist & elbows only, it is not visible but looks like little bumps or knots under the skin. It can be painful a needle like or biting sensation. I have sores from the continues scratching that sometimes bleed on there own. Sometimes bumps look like ant hills or mini volcanos. It feels like bugs are crawling under and on top of the skin feeling increases at night time. I am fatigued, brain feels foggy, cant sleep very well, have mood swings and often depressed. nothing seems to help it, I don't know where to turn for help. Do you have any idea what it may be?