Tā gēbo shàng zhǎng le yì quān yì quān de hóngbān, yīshēng shuō shì tǐxuǎn.
He had ring-shaped red patches on his arm, and the doctor said it was ringworm.
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癣 infections are named by where they grow: 头癣 (scalp), 体癣 (body), 股癣 (groin), 手癣 (hands) and 脚癣 (feet). Body ringworm spreads as red rings with a scaly edge and a clearer center, which gives it its English name.