Salicylic acid is one of the most popular ingredient in anti-acne cleansers, creams and gels. Known as a mild beta-hydroxy acid, this acid is used to treat comedonal or non-inflamed acne. It also has more widespread uses including treatment of warts and dandruff, among many others.
Salicylic acid works for acne because it can penetrate the follicles and encourage the shedding off of dead skin cells. In the process, it can reduce pore blockage and diminish acne breakouts on the skin as well. For acne, salicylic acid of concentrations of 2% or less is usually enough.
Unlike other acne treatment ingredients, salicylic acid can effectively eliminate 
clogging from its root. Benzoyl peroxide can only kill bacteria on the surface of the skin, so a comprehensive over-the-counter acne regimen can include both salicylic acid and benzoyl peroxide.
Many dermatologists recommend the use of salicylic acid containing products for pimples and acne. Typically, they recommend topical application once a day. It is very potent that you are only to use them once a day, so that if you choose to use salicylic acid gel, you are discouraged on using any other salicylic acid-containing products. This acid is known to excessively dry the skin, which will strip the skin of its much needed protection and make it more vulnerable to other skin problems.
When the skin is already clear, it is usually best to stop with topical medications and replace it with wash or scrub that contains salicylic acid for maintenance purposes. For best results, continuous use is necessary for continuous positive results. If treatment is stopped, the pores are likely to get clogged again, and the rest follows.
Are there side effects when using salicylic acid for acne?
Salicylic acid is essentially an acid, although a very weak one. It can cause skin irritation, burning and stinging, and regular application may lead to skin dryness, flaking and 
peeling. Thus, it is usually recommended to use salicylic acid containing products with a good oil-free moisturizer.
When your salicylic acid product causes extreme dryness, you might find it best to cut back on application (every other day instead of everyday) or changing to a product that contains less concentration. The lesser the concentration, the less likely will the formulation cause unwanted irritation.
Salicylic acid is undoubtedly one of the best ingredients against acne. However, for best results, use it in the proper dose and as instructed by your dermatologist.
