What is a common sign or symptom of eczema?

A common sign of eczema is reddened skin. Eczema, also known as atopic dermatitis, typically presents with inflammation of the skin, characterized by redness, swelling, and itching. The redness is a result of increased blood flow to the affected area as part of the body's immune response to irritants or allergens. Additionally, scratching the affected skin can further exacerbate reddening and can lead to the development of crusty patches or scaliness.

In contrast, persistent coughing, foul-smelling sputum, and cloudy urine are not associated with eczema. These symptoms indicate respiratory or urinary issues, which are unrelated to skin conditions. Eczema specifically affects the skin, making reddened skin the clear indicator in this context.