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The exact cause of atopic dermatitis (eczema) is unknown. Healthy skin helps retain moisture and protects you from bacteria, irritants and allergens. Eczema is likely related to a mix of factors:1  Dry, irritable skin, which reduces the skin's ability to be an effective barrier.2  A gene variation that affects the skin's barrier function.ealthy skin helps retain moisture and protects you from bacteria, irritants and allergens. Eczema is likely related to a mix of factors: 1  Dry, irritable skin, which reduces the skin's ability to be an effective barrier. 2  A gene variation that affects the skin's barrier function.
Externally caused eczema is also often called contact dermatitis. This is because the skin comes into contact with a foreign substance causing an occurrence of eczema. However, just as there are different types of eczema, there are different variations of contact dermatitis.