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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.
Heat can also trigger inflammation and itching. Besides directly causing eczema, hot temperatures cause the skin to dry out and also trigger sweating. Dry skin and sweating are two known triggers of eczema. When the skin gets dry, it cracks and wrinkles.