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痤 is a phono-semantic compound with the radical 疒 (chuáng), which denotes sickness or medical conditions, placing it within the semantic field of ailments. The component 坐 (zuò), meaning to sit, serves solely to indicate pronunciation and does not contribute to the meaning. Historically and in modern usage, the character refers to acne, pustules, or small skin boils. It is primarily encountered in the clinical term "痤疮" (cuóchuāng), the formal dermatological diagnosis for acne vulgaris. Its application is specialized, appearing mainly in medical contexts related to dermatology and the treatment of inflammatory skin conditions.
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