人类所患的各种皮肤病往往有相似的症状和体征，如瘙痒和红斑。
The various diseases that affect the human skin may present similar symptoms and signs, such as pruritus and erythema.
主观症状也可以是某种病的唯一表现，如瘙痒症，皮肤外观没有明显变化。
Subjective symptoms may be the only evidence of a disease, as in pruritus, and the skin appearance may be generally unremarkable.
另一方面，也可增厚，变粗糙和如索状，形成肥厚性疤痕或瘢痕疙瘩，引起重度瘙痒。
On the other hand, sometimes they grow thick, tough, and corded, forming a hypertrophic scar or keloid, and may cause severe pruritus.
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