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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