What causes hand eczema?

Depends: Eczema or dermatitis are terms for irritated skin. There are multiple reasons someone can get rashes on their hands. The most common cause is from irritant dermatitis caused by frequent exposure to moisture (sweating or hand-washing), soap, or other solvents. Other conditions that can cause hand rashes include infections, allergies, inflammatory conditions (psoriasis), etc.

Eczema: Eczema, or dermatitis, occurs in two main forms, both of which cause symptoms based on individual patients' sensitivity to certain substances. Contact eczema triggers include cosmetic products, jewelry materials and plants. Atopic eczema symptoms are sometimes associated with foods, abrasives and airborne contaminants.