Which of the following lesions is flaky exfoliated epidermis?

The correct answer is scale, which refers to flaky exfoliated epidermis that appears as thin, dry, and flaking pieces of skin. This condition is often seen in various dermatological conditions, where the normal turnover or shedding of skin cells is disrupted, leading to visible layers of dead skin that accumulate. Scales can differ in size, thickness, and color and are commonly associated with conditions such as psoriasis, eczema, and seborrheic dermatitis.

The other terms do not describe flaky exfoliated epidermis. A macule is a flat, discolored spot on the skin that does not have any thickness or dimension, while a bulla is a large blister filled with clear fluid, presenting as a raised area on the skin. The dermis, on the other hand, is the layer of skin beneath the epidermis and does not refer to any type of lesion or exfoliation. Understanding these definitions clarifies why scale is the correct choice in this context.