Homemade chemical solutions for skin problems need to be used with great caution, as incorrect formulations or dosages may cause skin irritation or more serious problems. If you decide to proceed, consider some of the following common active ingredients that are often used in commercial skin care products: 1. Salicylic Acid: Commonly used to treat acne, it has the effect of exfoliating and unclogging pores. 2. Glycolic Acid: A fruit acid that promotes skin metabolism and exfoliation, helping to improve skin texture. 3. Lactic Acid: A gentle exfoliant that also has moisturizing effects. 4. Benzoyl Peroxide: Used for antibacterial and acne treatment, it can reduce the number of bacteria on the surface of the skin. 5. Vitamin C: Has antioxidant effects, helps whiten and brighten the skin and anti-aging. 6. Niacinamide: Helps improve skin tone, reduce fine lines and improve skin barrier function. 7. **Hyaluronic Acid**: A very effective moisturizer that helps the skin retain moisture. Keep in mind the following points when trying to use these ingredients: - **Allergy test**: Perform an allergy test on the inside of your arm before use to ensure there is no adverse reaction. - **Concentration control**: Try to start with a low concentration to observe the skin's reaction. - **Photosensitivity**: Some ingredients (such as hydroxyethyl and salicylic acid) may increase the skin's sensitivity to sunlight, so be sure to use sunscreen after use. - **Consult a professional**: It is best to consult a dermatologist or professional beautician for guidance and advice. Homemade products are riskier and may not only affect the expected results, but may also cause skin problems, so they must be treated with caution.