The reasons for the formation of blackheads are large pores, too greasy skin, long-term use of poor quality and non-breathable cosmetics, seborrheic dermatitis and so on. For people with large pores, you can usually apply some blackhead removal masks, and after removing the blackheads, use makeup that shrinks the pores. People who use cosmetics regularly must remove their makeup before going to bed, to clean up their skin, and it is best not to use poor quality cosmetics. People with seborrheic dermatitis must pay attention to a light diet, do not eat spicy food, do not eat greasy and fried food, serious need to use drugs for treatment. In addition, eat more food containing vitamin C, such as kiwi, lemon, strawberries, cherries, etc.