Eczema is a general term for skin conditions that cause inflammation, dryness, redness, and itching. The most common type of eczema is atopic dermatitis, which usually starts in childhood and may run in families. Other types of eczema include contact dermatitis, dyshidrotic eczema, nummular eczema, and seborrheic dermatitis.
The exact cause of eczema is unknown, but it may be related to genetic and environmental factors. Some of the triggers that can worsen eczema include:
Allergens, such as dust mites, pollen, pet dander, or food
Irritants, such as soap, detergent, perfume, or wool
Stress, anxiety, or emotional distress
Temperature changes, humidity, or sweating
Infections, such as bacteria, viruses, or fungi