What is a common ingredient used for treating acne?

Salicylic acid is a well-known ingredient used for treating acne due to its ability to penetrate deep into the pores. It is a beta-hydroxy acid (BHA) that works by exfoliating the skin, helping to shed dead skin cells that can clog pores and lead to breakouts. Additionally, salicylic acid has anti-inflammatory properties, which can reduce redness and swelling commonly associated with acne lesions. It also helps to regulate oil production, making it particularly effective for individuals with oily skin types.

Glycolic acid, while useful for exfoliation and improving skin texture, is an alpha-hydroxy acid (AHA) and may not address acne as effectively as salicylic acid, which is specifically designed to target and treat blemishes. Citrus extracts may have some astringent properties but are not primarily used as a treatment for acne. Collagen, on the other hand, is beneficial for skin hydration and elasticity but does not have direct properties for acne treatment.