Skin Lesions (Encyclopedia of Medicine)
A skin lesion is a superficial growth or patch of the skin that does not resemble the area surrounding it.
Skin lesions can be grouped into two categories: primary and secondary. Primary skin lesions are variations in color or texture that may be present at birth, such as moles or birthmarks, or that may be acquired during a person's lifetime, such as those associated with infectious diseases (e.g., warts, acne, or psoriasis), allergic reactions (e.g., hives or contact dermatitis), or environmental agents (e.g., sunburn, pressure, or temperature extremes). Secondary skin lesions are those changes in the skin that result from primary skin lesions, either as a natural progression or as a result of a person manipulating (e.g., scratching or picking at) a primary lesion.
The major types of primary lesions are:
- Macule. A small, circular, flat spot less than 0.4 in (1 cm) in diameter. The color of a macule is not the same as that of nearby skin. Macules come in a variety of shapes and are usually brown, white, or red. Examples of macules include freckles and flat moles. A macule more than 0.4 in (1 cm) in diameter is called a patch.
- Vesicle. A raised lesion less than 0.2 in (5 mm) across and...
(The entire section is 2078 words.)
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