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Nummular eczema, also known as nummular dermatitis, is a type of eczema characterized by round, coin-shaped lesions on the skin. It is often associated with atopic dermatitis, which is a chronic inflammatory skin condition. Individuals with a history of atopic dermatitis may be more susceptible to developing nummular eczema, particularly during dry skin conditions or periods of exacerbation.

Atopic dermatitis itself is a multifactorial condition, often driven by a combination of genetic, environmental, and immunological factors. The skin barrier dysfunction noted in atopic dermatitis can lead to increased susceptibility to irritants and allergens, further contributing to the development of nummular eczema. The lesions typically occur on the arms and legs, coinciding with areas where individuals might have a history of atopic dermatitis episodes.

This connection emphasizes the importance of recognizing atopic dermatitis when evaluating a patient with nummular eczema, as management strategies might overlap, focusing on hydration and barrier repair. Recognizing this relationship helps inform proper treatment and preventative measures for patients experiencing these skin conditions.