硬皮病（英语：Scleroderma），也称系统性硬化症，是一种以局限性或弥漫性皮肤增厚和纤维化为特征的全身性自身免疫病。病变特点为皮肤纤维增生及血管洋葱皮样改变，最终导致皮肤硬化、血管缺血，除皮肤受累外，它也可影响内脏（心、肺和消化道等器官）。女性发病率为男性的3～4倍。

病变可以分为三期：1.水肿期：皮肤光滑、发亮、肿胀；2.硬化期：皮肤纤维化、坚实、不能折皱；3.萎缩期：皮肤萎缩变薄，伴以色素沉着。

分为两种：局限性的呈点滴状、片状和条状，边缘明显；系统性的常从肢端开始，逐渐发展，形成边缘模糊、较为广泛的大片，分布对称。

Scleroderma, also known as systemic sclerosis, is a chronic systemic autoimmune disease characterised by hardening (sclero) of the skin (derma). In the more severe form, it also affects internal organs.

Limited scleroderma involves cutaneous manifestations that mainly affect the hands, arms and face. It was previously called CREST syndrome in reference to the following common manifestations: calcinosis (the deposition of calcium nodules in the skin), raynaud's phenomenon (exaggerated vasoconstriction in the hands, with fingers undergoing white-blue-red color transitions in the cold), esophageal dysfunction (leading to difficulty swallowing), sclerodactyly (skin thickening on the fingers), and telangiectasias (dilated capillaries on the face, hands and mucous membranes).