Discussion on the frequency of use of azelaic acid
Where azelaic acid is used, the frequency is determined, and it is related to the effect and the skin, so it should not be careless. For beginners, the skin is not used to it, so it should be slowed down. You can use it once a day, apply it thinly to the skin, and observe its reaction. If the skin has no discomfort, such as prickles, itching, and redness, then gradually increase the frequency.

When the skin is suitable, it can be increased to once a day. However, for oily skin, it can be used twice a day to control oil and help it show effect. However, when using it at night, it needs to be protected from light, because sunlight may reduce its effect, and it is dangerous to sensitize the skin.

For sensitive skin, a skin test must be done Apply a little behind the ear or in the wrist and observe. If there is no difference, it can be used on the face at first, and the frequency should be low, and it is appropriate to use it once every two days. Look at the skin state and then change the frequency.

In short, the frequency of azelaic acid use varies according to the skin type and skin state, and it is important to have a safe and effective skin.