The diagnosis of acne is mainly based on age, skin rash and the location Morphological, such as occurred in young people, to see the black, red papules, small abscess or small nodules, and so on, can generally be diagnosed with acne, but the following regular See the need to identify the facial skin:
(1) flat wart: only one flat papules, from the needle to the size of rice grains, at the top of the papule is flat, the number could be as much or as little, if no other abscess, nodules, skin rash, such as black.
(2) atopic dermatitis: a sudden rash, red can be seen, the size of the needle red papules, diffuse distribution, and sometimes can be seen or used any cosmetics products for external use, such as paint or come into contact with, but not the characteristics of acne.
(3) seborrheic dermatitis: mainly in the nasal weeks, involving the nose, etc., with red skin rash mainly greasy-Lin Xie, a clear edge sector, a slight itching, no papules, pustule, and other skin lesions.
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