Some ingredients in lipsticks may even cause dullness. In addition, lip care is a matter of both beauty and health. According to medical findings, sun screening for lips is somewhat related to cold sores, as the UV rays can weaken immunity, resulting in internal virus. Therefore, those subject to cold sores should pay attention to the sun screening for lips.
The lips are mainly made up of mucous without any stratum corneum or sebum line as with that on the skin. So lips are actually very fragile and to be doubly protected. Poor circulation, UV rays colored and lipsticks will all cause pigmentation.
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