The doctor asked Yu Yi: "Can glycolic acid and azelaic acid be mixed?"

The doctor said: "Mixing the two has both advantages and disadvantages. Glycolic acid exfoliates keratin, promotes cell renewal, refreshes the skin and increases transparency; azelaic acid is antibacterial and anti-inflammatory, regulates oil secretion, inhibits melanin production, and is beneficial to acne muscles and pigmentation."

"However, both have a certain irritation. When mixed, the skin may be intolerant, causing redness, swelling, tingling, and itching. If the skin is sensitive and weak, you need to be careful. When you want to mix it, you should try it on a small scale first to observe the skin's reaction. The concentration should be low at the beginning and gradually increase, so that the skin can adapt. And you need strict sun protection after use to avoid skin damage. "

The questioner nodded and said," I would like to be taught. "