There are multiple types of skin lesions, which medical experts classify using a specialized language. Descriptions include the type of lesion, configuration, texture, location, distribution, and color. "Rash" is a general term for skin lesions, but it is not specific enough for a diagnosis. The qualities of the rash often give doctors clues to the cause.
Macules are skin lesions that are usually less than 10 mm across. There is no change in skin thickness or texture, in most cases. The rashes associated with rubella and measles are macular, but others are benign, like freckles and moles. Macules appear in some chronic conditions, too. The depigmented spots in vitiligo are also considered macules.
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