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Diagnostic points of cutaneous amyloidosis

Primary cutaneous amyloidosis means that amyloid is only deposited in normal skin, and the lumen is not involved. Common in China. According to the characteristics of skin lesions, it is divided into: the skin on the surface of nodules is atrophied and has a soft feeling. Some occur in the anus and sacrum of the elderly, showing a radial brown patch centered on the anus, which has an itchy feeling.