Which type of lesion is characterized as a pustule?

A pustule is specifically characterized as a raised, inflamed lesion that is filled with pus. Pustules typically appear as small, raised bumps on the skin and are often associated with conditions like acne or folliculitis. The presence of pus distinguishes a pustule from other skin lesions, as it indicates an accumulation of white blood cells and other fluids in response to infection or inflammation.

The other types of lesions mentioned include flat discolored areas, which are not raised and lack the filled characteristic of a pustule; rough, scaly patches that represent a different texture and presentation, often found in conditions like psoriasis; and open sores or wounds, which signify a break in the skin but do not specifically describe the inflamed and pus-filled characteristics of a pustule. Understanding the unique features of each type of lesion is crucial in skin care and dermatological assessments.