In clinical dermatology, the ability to accurately describe a skin lesion is the foundation of a correct diagnosis. When a clinician examines a patient, they do not simply say "a spot"; instead, they use standardized terminology to describe the lesion's size, shape, texture, and depth. This systematic approach allows for clear communication between healthcare providers and helps track whether a condition is improving or worsening over time.
Primary skin lesions are the initial physical manifestations of a disease process. They are categorized based on whether they are flat, raised, fluid-filled, or represent a loss of skin integrity.
Flat Lesions: Macules and Patches
The simplest skin lesions are those that change the color of the skin without altering its texture or height. These are "nonpalpable," meaning you cannot feel them if you run your finger over the area.
- Macule: A small, flat area of discoloration that is less than 1 cm in diameter. An example would be a small freckle.
- Patch: A flat area of discoloration that is larger than 1 cm. Think of a large birthmark or a sunspot.
Exam Tip: When distinguishing between a macule and a patch, the only variable is size. If you can feel a bump, it is no longer a macule or a patch.
Raised and Solid Lesions: Papules, Plaques, and Nodules
When a lesion becomes palpable (you can feel it), it is classified by its height and how deep it penetrates the skin layers.
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