Why does hot weather always produce a lot of grease on people's faces, especially in southerly days with particularly high humidity?

Spring is a season of active human functions. The metabolism of the skin becomes very active, and the secretion of sebaceous glands and sweat glands is increasing day by day. Sebaceous gland secretion tends to be vigorous ~ especially when the seasons alternate ~ the skin can't adapt immediately ~ there will be imbalance ~ which will lead to excessive oil secretion on your face ~ and your skin is short of water ~ which can be improved by adding some lotion ~