Key takeaways
Salicylic acid (Salex) and tretinoin (Retin-A) are both topical medications used to treat acne, but they belong to different medication classes. Salicylic acid is a keratolytic agent that helps exfoliate the skin and unclog pores, while tretinoin is a retinoid, a form of vitamin A that replaces old skin cells with new ones and also unclogs pores. Salicylic acid is available over-the-counter and by prescription in various forms like creams, gels, and shampoos, whereas tretinoin is only available by prescription as a cream or gel. Salicylic acid can treat a wide range of skin conditions, including warts, psoriasis, and dandruff, while tretinoin is specifically FDA-approved for acne. You can use salicylic acid multiple times a day, but tretinoin is typically applied once daily, usually at bedtime. Common side effects of salicylic acid include dry and irritated skin, while tretinoin can cause skin redness, peeling, and increased sensitivity to sunlight. It's important to avoid using both medications together without consulting a healthcare professional as they can increase skin irritation.
