水楊酸和果酸作用原理有些近似，都能幫助肌膚老舊角質代謝，麥拉寧色素也跟隨角質層剝落，因而有淡化黑斑的效果；果酸為水溶性、水楊酸則為油溶性，也許更能深入毛細孔，有達到細緻肌膚、縮小毛細孔的效果。使用於肌膚後需特注意後續的防曬措施，以避免色素沈澱的問題。對毛孔中的角質拴塞溶解效果佳，但會造成皮膚變薄及乾燥。衛生署規定濃度限量 0.2%~2.0%，屬含藥化粧品。
Also known as BHA (hydroxy acid BHA), it has multiple functions, exfoliating, anti-inflammatory, and sterilizing. It can increase the thickness of the skin, improve the protective function of the skin, and stimulate the production of collagen. Salicylic acid at a concentration of 8% to 12% can be used to treat viral warts, and salicylic acid at 0.5% to 2% is much milder and can be used for exfoliating skin care.
The principle of action of salicylic acid and fruit acid is somewhat similar, both of which can help the skin's old keratin metabolism. Melanin pigment also peels off the stratum corneum, so it has the effect of diminishing dark spots; fruit acid is water-soluble and salicylic acid is oil Solubility, it may be able to penetrate deeper into the pores and achieve the effect of thinning the skin and reducing the pores. After using it on the skin, you need to pay special attention to the follow-up sun protection measures to avoid the problem of pigmentation. It has a good dissolving effect on the keratin plugs in the pores, but it will cause the skin to become thin and dry. The Department of Health stipulates a concentration limit of 0.2% to 2.0%, which is a medicated cosmetic.
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