摘要
皮肤是宿主和环境之间的一道屏障。它由数层结构组成。最表面不含血管的薄层是表皮，覆于真皮之上，真皮层则较厚，包含毛囊、皮脂腺和汗腺。皮下脂肪位于真皮之下，与肌肉层之间相隔一层坚硬的筋膜。感染可以侵犯其中一层或几层结构。
The skin acts as a barrier between the host and the environment. It comprises several layers. The most superficial is the epidermis,a thin avascular layer overlying the dermis,which is a thicker layer containing hair follicles, sebaceous glands and sweat glands. Subcutaneous fat lies beneath the dermis and is separated from muscle by a tough layer of fascia. Infections may affect one or more of these layers.
