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TABLE 4-1 ■ Basic Types of Skin Lesions n i

Primary Lesions (May Arise From Previously Normal Skin)

Circumscribed, Flat, Nonpalpable Changes in Skin Color

Palpable Elevated Solid Masses

Macule—Small flat spot, up to 1.0 cm

Examples: freckle, petechia

Papule—Up to 1.0 cm. Example: an elevated nevus

Plaque—Elevated superficial lession 1.0 cm or larger, often formed by coalescence of papules

Nodule—Marble-like lesion larger than 0.5 cm, often deeper and firmer than a papule

Wheal—-A somewhat irregular, relatively transient, superficial area of localized skin edema. Examples: mosquito bite, hive

Circumscribed Superficial Elevations of the Skin Formed by Free Fluid in a Cavity Within the Skin Layers

Vesicle—Up to 1.0 cm; filled with serous fluid. Example: herpes simplex

Bulla—1.0 cm or larger; filled with serous fluid. Example: 2nd-degree burn

Pustule—Filled with pus. Examples: acne, impetigo

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