What is Salicylic Acid? What are its benefits?
In the 19th century, European scientists purified salicylic acid from willow bark; consequently, it is also referred to as “willow acid.” However, it is now known that salicylic acid is not found exclusively in willow bark; the same compound has also been discovered in other plants, such as wintergreen leaves and sweet birch trees.
Salicylic acid is an organic acid containing a benzene ring. Because its hydroxyl group is situated at the beta (β) position, it is also known as a beta-hydroxy acid (BHA). The structural characteristics of the benzene ring make it lipophilic (fat-soluble); as a result, salicylic acid can penetrate the skin more easily to exert its effects.
Under Taiwan’s cosmetics regulations, salicylic acid is classified as a medicated cosmetic ingredient, with an allowable concentration range of 0.5% to 2%. Even at low concentrations, it helps enhance keratin turnover, condition the skin, and provide soothing hydration. It is most commonly used to address skin issues such as acne and comedones (blackheads and whiteheads).
In medical aesthetics clinics, however, it is applied at higher concentrations in chemical peels to achieve skin resurfacing and rejuvenation effects.
What is the difference between AHA and BHA? Why choose Salicylic Acid?
Acid-based exfoliation treatments are generally categorized into two types: AHA and BHA. AHA, also known as alpha-hydroxy acid, is a water-soluble acidic compound (e.g., lactic acid, citric acid). BHA, or beta-hydroxy acid, is a lipid-soluble (fat-soluble) acidic compound. Salicylic acid is a BHA; thanks to its lipid-soluble nature, it exhibits high compatibility with the skin’s keratin layer, allowing it to penetrate deeper into the skin to facilitate cellular turnover. Furthermore, salicylic acid helps unclog pores and promotes the renewal of dead skin cells, making it particularly suitable for use on oily and acne-prone skin.
Benefit 1 of Salicylic Acid: Maintaining Oil-Moisture Balance
Skin that produces excessive sebum is prone to developing issues—such as comedones and acne—caused by oil clogging the pores. With its lipophilic properties, salicylic acid helps regulate excess sebum production and unclog pores, thereby enabling the skin to maintain a healthy balance between oil and moisture.
Benefit 2 of Salicylic Acid: Smoothes and Softens the Skin
When dead skin cells accumulate on the surface, the skin becomes rough and prone to comedones and acne. This buildup not only makes the complexion appear dull but also hinders the absorption of skincare products. Salicylic acid promotes skin cell turnover; it works by softening and shedding dead skin cells, resulting in a smoother, softer texture. Consequently, salicylic acid is particularly well-suited for individuals with oily or acne-prone skin.
Benefit 3 of Salicylic Acid: Improves Uneven Skin Tone
Skin imperfections—such as dark spots and acne scars—gradually fade and disappear as dead skin cells are shed and renewed. Typically, the skin’s natural cell turnover cycle takes approximately 28 days; by accelerating the shedding of dead cells, we can also speed up the fading of spots and scars. Clinical studies have confirmed that salicylic acid accelerates cell turnover and helps resolve issues related to melanin accumulation, thereby evening out skin tone and enhancing radiance. Furthermore, because salicylic acid shares a structural similarity with aspirin, it offers soothing properties that help calm the skin during the exfoliation process, preventing any potential discomfort or irritation.
What types of products contain salicylic acid?
Salicylic acid is commonly found in facial skincare products, such as cleansers, toners, and serums. In recent years, it has also increasingly been incorporated into body care products, including body washes, sprays, and lotions.
What is the correct order for using salicylic acid products? What precautions should be taken?
The placement of salicylic acid in your routine depends on the specific product category (e.g., cleanser, toner, serum). Simply follow the standard skincare regimen: Cleansing → Salicylic Acid Product → Toner → Serum → Moisturizer.
When introducing a salicylic acid product, it is advisable to perform a patch test first—for instance, on the inner forearm or behind the ear—to ensure it does not cause skin irritation or an allergic reaction. Initially, it is recommended to use the product every 2–3 days; once your skin has built up a tolerance, you may transition to daily use. Be sure to follow up with adequate moisturization after using salicylic acid to prevent potential discomfort or peeling.
Who should—and shouldn’t—use salicylic acid?
Whether or not salicylic acid is suitable for you depends primarily on your skin type—specifically, whether your skin is oily or dry. Salicylic acid is particularly well-suited for oily and acne-prone skin types. This is because these skin types are more susceptible to issues such as the accumulation of dead skin cells and excessive sebum production. Since salicylic acid works to accelerate cell turnover and regulate oil secretion, it is an ideal ingredient for individuals with oily or acne-prone skin.
However, those with dry skin should exercise particular caution when using salicylic acid. Because dry skin produces less sebum and typically has a thinner stratum corneum (outer skin layer), it is crucial to prioritize moisturizing steps—such as applying lotions and serums—after using salicylic acid products. This helps prevent adverse reactions like peeling or increased sensitivity caused by excessive dryness.
Other groups for whom salicylic acid is not recommended include:
Individuals with eczema
Individuals with atopic dermatitis
Individuals with G6PD deficiency (Favism)
Due to the potential for unpredictable triggers within these three specific groups, it is strongly advised to consult a physician before using any products containing salicylic acid.
Are there any side effects or contraindications associated with using salicylic acid?
Since salicylic acid accelerates cell turnover, it can be mildly irritating to the skin. For individuals with sensitive skin, using products containing salicylic acid may result in mild redness, swelling, itching, or dryness. If these symptoms occur, they can typically be alleviated by lowering the product’s concentration, reducing the frequency of use, and intensifying your moisturizing routine. Once your skin has built up a tolerance, you can adjust the frequency and concentration according to your personal needs. However, if skin irritation becomes severe, you should immediately consult a medical professional.
Common Q&A: Salicylic Acid Anti-Acne Body Wash
Q1: Is salicylic acid body wash only suitable for acne-prone skin?
Salicylic acid body wash is suitable for all skin types! Salicylic acid is an ingredient that can be safely used by everyone, regardless of their skin type; it is not restricted solely to those with acne-prone skin, so it is perfectly fine for other skin types to use as well. Of course, if you have oily skin or are struggling with acne, using salicylic acid is highly recommended to help accelerate cell turnover and address those specific concerns.
Q2: Will using salicylic acid body wash cause my skin to darken (hyperpigmentation)?
Salicylic acid is not photosensitizing, so it will not cause your skin to darken! Although salicylic acid itself does not cause hyperpigmentation, the process of chemical exfoliation can temporarily leave the skin’s stratum corneum slightly more vulnerable. Therefore, it is highly recommended to practice proper sun protection—such as applying sunscreen—to shield your skin from potential irritation caused by ultraviolet (UV) rays.
Q3. Should I let the salicylic acid body wash sit on my skin?
Since the body wash contains salicylic acid and other ingredients designed to help unclog pores, we recommend leaving it on for 3–5 minutes to achieve even better results!
