Which of the following concentrations of salicylic acid is commonly used for superficial chemical peels?

The commonly used concentration of salicylic acid for superficial chemical peels is 20%. This concentration effectively targets superficial skin issues, such as mild acne, oily skin, and the early signs of aging, while maintaining a good safety profile for most individuals. At this level, salicylic acid penetrates the outer layer of the skin, promoting exfoliation and enhancing the skin's texture without causing excessive irritation.

Lower concentrations, like 10%, may not provide sufficient exfoliating effects for a noticeable improvement in skin conditions. Higher concentrations, such as 30% or 50%, are typically reserved for deeper chemical peels, which are applied by professionals in a controlled setting and may lead to more significant peeling and recovery time. Therefore, 20% stands out as the effective choice for superficial peels that balance efficacy with safety for the patient.