On the Usage of Glycolic Acid on Oily Skin
In this sentence, for oily skin, the use of glycolic acid should be done with caution. Glycolic acid has special properties, and it has advantages and disadvantages for the maintenance of oily skin. Only by understanding its reasons can it be used well.

Anyone who wants to use glycolic acid on oily skin should first know the shape of the skin. For oily skin, the sebaceous glands secrete vigorously, the face is often oily, and it is prone to acne. Glycolic acid has the ability to exfoliate, which can dredge pores and make oil secretion smooth, but it is slightly stronger. If the skin is sensitive, it may cause discomfort if used rashly.

The method of use should be less and thinner at first. It is advisable to use an appropriate amount of products containing glycolic acid, such as those produced by "The Ordinary", before trying it on the small skin behind the ear or under the mandible. Wait for one day and night, if there is no abnormality, such as redness, itching, tingling, etc., before using it on the face. For the first time, it is appropriate to use it once to twice a week. Apply it evenly to the cleansed and dried face with a gentle technique to avoid delicate areas such as the eyes and lips.

After applying, pay attention to the skin's reaction. If it feels slightly warm, this is normal, and it is a sign of the role of glycolic acid. If the tingling is unbearable, wash it off with water as soon as possible and stop using it temporarily. When the skin recovers, try again, or reduce the dosage and frequency.

Furthermore, during the use of glycolic acid, sun protection is essential. Because the skin is more sensitive to ultraviolet rays after the action of glycolic acid. When going out during the day, you must use sunscreen, an umbrella and a hat are also essential to avoid sunburn, tanning and pigmentation of the skin.

As for the follow-up, you can use it more frequently depending on the skin's adaptation, but at most three to four times a week, not too much. In this way, oily skin can borrow the power of glycolic acid to improve oil secretion, making the skin clear and smooth without damaging the skin, and achieving the purpose of maintenance.