Rash on back of hand?
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There are many ways a person can get a hand rash, but all have some aspects in common. The skin is exposed to something irritating. It reacts with a rash. Hand eczema is another name for the same thing.
Most hand rash cases are called "contact dermatitis" because they are caused by contact with substances found in the environment. A powerful irritant, like some industrial chemicals, acids or cleaning fluids, are obvious causes of contact dermatitis. More often, the irritant is milder and the problem starts out as dryness of the hands. A few of the more common irritants are over drying due to frequent hand washing, soaps, cleaning agents or even ingredients in skin and personal care products.
The inflammation appears as redness, swelling and itching. The skin looses its ability to serve as a barrier and keep the outside world out. It allows more outside irritants in. Until all the irritants are removed, the skin will not heal. Once skin becomes red and dry, even so called "harmless" things like water and baby products can irritate skin further. This is a cumulative irritant dermatitis, in that it is not one big irritant but a lot of small ones.
Have you been around any poison ivy lately? The rash looks like little pimples with clear tops. The clear "serum" in the tops is what spreads the rash when you scratch. Get some calamine lotion & try not to scratch it.
It could be a form of contact dermititis (were you wearing anything on your wrist?) or it could be an allergic reaction to something on your hand.
I would get it checked by a doctor...
The source below discusses skin rashes. I am not sure if it discusses what you may have but you can take a look anyway.
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