化妆品是直接用于皮肤的化学制品,其成分有引起接触性皮炎、色素沉着型皮炎等过敏反应的可能。接触性皮炎是因化学物质接触皮肤而引起的皮肤炎症,按发病机制可分类如下。 1.一次性刺激性皮炎:是指只要是被接触物质的刺激大于皮肤抵抗阈值,不管是什么人都可能发生的皮炎。物质对皮肤的刺激性强,仅一次接触就发病的称之为急性毒性皮炎。物质对皮肤的刺激性弱,一次接触不发病,但反复刺激同一部位,完全超过了皮肤抵抗阈值,把由此而产生的接触性皮炎称之为蓄积障碍性皮炎。急性毒性皮炎起病急,伴有灼热感、疼痛等明显自觉症状,且炎症仅限接触 Cosmetics are chemicals that are used directly on the skin and have the potential to cause allergic reactions such as contact dermatitis and pigmented dermatitis. Contact dermatitis is caused by chemical skin contact with skin inflammation, according to the pathogenesis can be classified as follows. 1. Disposable irritant dermatitis: refers to the skin as long as the stimulus is greater than the threshold of skin resistance, no matter what people may occur dermatitis. Material irritation to the skin is strong, only one exposure to the disease called acute dermatitis. Material irritation of the skin is weak, a contact without disease, but repeated stimulation of the same site, completely beyond the threshold of skin resistance, the resulting contact dermatitis called accumulation of dysplastic dermatitis. Acute dermatitis acute onset, accompanied by burning sensation, pain and other obvious symptoms, and inflammation is limited to contact