Which skin condition may be caused by a genetic predisposition and manifests with dry, itchy patches?

• A. Vesicular eczema
• B. Atopic dermatitis
• C. Psoriasis
• D. Contact dermatitis

Answer: (B)

Atopic dermatitis is often associated with a genetic predisposition, particularly in individuals who have a family history of allergies or asthma. This condition manifests as dry, itchy patches on the skin, typically affecting areas such as the face, elbows, and knees in children, though it can persist into adulthood. The dry patches occur due to a compromised skin barrier, leading to increased transepidermal water loss and susceptibility to irritants and allergens, which can further exacerbate inflammation and itching.

In contrast, other skin conditions mentioned do not primarily hinge on genetic factors to the same degree; for example, contact dermatitis is more related to environmental triggers rather than a genetic predisposition. Psoriasis, while it can have a genetic component, is characterized by a different underlying pathophysiology involving an accelerated skin cell turnover and immune response rather than primarily presenting as dry and itchy patches. Lastly, vesicular eczema usually involves vesicles and blisters, distinguishing it from the typical presentation of atopic dermatitis. Understanding these differences helps clarify why atopic dermatitis is the most accurate choice regarding genetic predisposition and symptomatology.