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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.

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1. Macules

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.

freckles macules benign Nicola Tree / Getty Images
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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.