The Salicylic acid does not require a prescription in the United States, but in many European countries concentrations above 10% require a prescription. It is normal to experience some visible peeling within 2-3 days of using the product, but not all people will notice visible peeling. It depends on the thickness of the stratum corneum and peeling will stop as this layer becomes more compact with repeated use. If used as a spot treatment, you can apply once a day to acne bumps. Each person’s skin is different, and if redness persists, apply every other day. If you have any questions or concerns about the strength of our products, please feel free to contact us or consult with your dermatologist.