O'Brien T J, Hall A P
Geelong Hospital, Victoria, Australia.
Australas J Dermatol. 1997 Aug;38(3):163-4. doi: 10.1111/j.1440-0960.1997.tb01138.x.
Terra firma-forme dermatosis (TFFD) is a relatively common but usually unrecognized clinical problem. The cause is unknown. The changes usually occur on the neck in childhood as dirty brown patches that cannot be removed with soap but are easily removed with alcohol. Terra firma-forme dermatosis may be mistaken for acanthosis nigricans.
地衣状皮肤病变（TFFD）是一个相对常见但通常未被认识到的临床问题。其病因不明。病变通常在儿童期出现在颈部，表现为脏污的棕色斑块，用肥皂无法去除，但用酒精很容易去除。地衣状皮肤病变可能会被误诊为黑棘皮病。
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