Stridex salicylic acid cotton pads are made with an alcohol-free, PH-friendly formula. Pre-soaked in an adequate amount of solution, they can complete keratin conditioning and care after cleansing in one step: BHA can dissolve sebum plugs and penetrate deep into pores, effectively improving blackheads, closed pores and periodic acne. **Sensitive 0.5% (containing aloe vera) ** Milder, suitable for first-time users or those with allergies; Essential 1% (containing vitamins) for daily stability maintenance; Maximum 2% for stubborn blockages and oiliness. Usage suggestion: After cleansing your face at night, take one piece and gently wipe along the T-zone and areas prone to blockage, avoiding the area around the eyes or wounds. Beginners should start 2 to 3 times a week. Once they get used to it, they can increase it to every other day. Then apply moisturizing and be sure to apply sunscreen during the day. For external use only. If continuous irritation occurs, discontinue use and consult a professional. Please consult a doctor before pregnancy or breastfeeding.