What condition is characterized by the presence of blackheads or whiteheads?

The condition characterized by the presence of blackheads or whiteheads is accurately described as comedonal acne. Comedonal acne is a specific type of acne that manifests as comedones, which are clogged hair follicles, and can appear as open comedones (blackheads) or closed comedones (whiteheads).

Acne vulgaris, while it does encompass a broader range of acne types, including inflammatory lesions like papules and pustules, specifically refers to acne in general and is not limited to just the presence of comedones. Therefore, understanding the distinction between general acne and its specific forms is crucial.

Cystic acne, on the other hand, refers to a more severe form of acne that involves deep, inflamed cysts and is not characterized solely by comedones. Restless skin syndrome, while a recognized skin condition, does not relate to the presence of blackheads or whiteheads at all.

Thus, for pinpointing the condition that directly relates to blackheads and whiteheads, comedonal acne holds the correct classification.