The Ordinary, a high-profile skin care product, has gained popularity in the field of skin care in recent years. When applied to underarm care, it can also bring many unexpected benefits.

Benefits
1. ** Gentle exfoliation **: The underarm skin is different from other parts of the body, and its stratum corneum is easy to accumulate. Glycol acid has a mild exfoliation effect, which can effectively dissolve the connecting substances between the aging keratinocytes of the underarm, so that the accumulated stratum corneum naturally falls off, allowing the underarm skin to return to smooth and delicate, and avoiding problems such as dullness caused by too thick keratin.
2. ** Regulate oil secretion **: There are more sebaceous glands distributed under the armpit, which are prone to produce oil. Glycol acid toner can regulate the secretion function of the sebaceous glands, reduce the excessive secretion of oil, keep the armpits fresh, and reduce the chance of odor caused by the growth of bacteria due to excessive oil.
3. ** Improve dullness **: Long-term friction, sweating and other factors can easily make the underarm skin dull. Glycolic acid can accelerate the skin's metabolism and promote the excretion of melanin metabolism, thereby gradually improving the dullness of the underarm skin and making the underarm skin shine again.
4. ** Bacteriostatic and deodorizing **: The acidic environment of glycolic acid is not conducive to the growth and reproduction of bacteria. It can inhibit the growth of underarm bacteria to a certain extent, thereby reducing the production of odors and keeping the underarms fresh.

How to use
1. ** Clean the underarm skin **: Before using the glycolic acid toner, clean the underarm skin with mild bath products to remove dirt and sweat and ensure dry skin.
2. ** Topical trial **: When using it for the first time, take a small amount of toner and apply it to a small patch of skin under the armpit. Observe for 1-2 days to see if there is any allergic or uncomfortable reaction. If symptoms such as redness, swelling, itching appear, etc., you should stop using it immediately.
3. ** Normal use **: If there is no discomfort, dip a cotton pad in an appropriate amount of glycolic acid toner and gently wipe the skin under the armpit. Pay attention to gentle movements to avoid excessive friction. You can start with a small amount and gradually increase the dosage and frequency of use. At the beginning, it is recommended to use it 1-2 times a week. After the skin gets used to it, it can be increased to 3-4 times a week according to its own situation.
4. ** Follow-up care **: After using the toner, you can apply a special moisturizing lotion or antiperspirant product for the underarm according to your personal needs to further care for the underarm skin.

When using glycol acid toner to care for the underarm skin, pay close attention to the skin reaction and follow the correct use method to give full play to its effect and harvest a healthy and refreshing underarm skin state.