我2年前第一次发作,不明真相,一直猛擦唇膏(当时用的就是Burts' Bees),以为能管用,感觉是情况越来越糟糕。不得已去空总皮肤科开了些药,也就是日常抗皮炎过敏的药膏还有医院自制的皮肤霜,三五天后好了。听医嘱,几乎停用了口红,少用润唇膏。但一年后又复发了,当时开的药也过期了。仔细查了可能的过敏原,口红里有eosin, or a contaminant of it: the commonest allergen identified in lipsticks up until 1960. Since then eosin has been used less often in lipstick formulations and is also more highly purified, so is rarely a problem now.
ricinoleic acid:the main constituent of castor oil, has been identified in several large case series as the commonest current cause of allergic cheilitis due to lip cosmetics.