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Irritant contact dermatitis. Irritant contact dermatitis occurs when your skin comes into direct contact with a substance that damages the outer layer of your skin, causing redness, itching, and a burning or stinging sensation.
Contact Dermatitis. The causes of red rashes on hand are legion, but contact dermatitis is one of the common causes. There are two kinds of contact dermatitis: I. Classic allergic contact dermatitis develops from allergies to things like hair dyes, wood-working chemicals, rubber, nickel, formaldehyde and Neosporin.