Homemade chemical solutions for the treatment of skin problems are at greater risk, and it is not recommended for non-professionals to try them. The skin is an important protective barrier for the human body, and improper chemical ratios may cause irritation, allergies, burns, and even systemic poisoning. The following are safer suggestions： 1. **Professional consultation is preferred** Any skin problems should first be diagnosed by a dermatologist. Specific medicines are required for different conditions (such as eczema, acne, and fungal infections), such as： -Antibiotics (clindamycin) -Antifungal (ketoconazole) -Anti-inflammatory (hydrocortisone) -Vitamin A acids (strictly follow the doctor's instructions) 2. **Reference to basic safety ingredients** If it is only for daily soothing (non-therapeutic use), the following low-risk ingredients may be considered, but local testing is still required： -**Moisturizer**: glycerin, hyaluronic acid - **Soothing ingredients**: Panthenol (vitamin B5), oat extract -**Weakly acidic cleansing**: pH5.5 amino acid phenylactivity (such as sodium cocoylglycine) 3. **Absolutely avoid dangerous behavior** -Mix strong acids/alkalis by yourself (such as high concentrations of salicylic acid and sodium hydroxide) -Use industrial or non-pharmaceutical grade chemicals -Microbial contamination caused by non-sterilized operation 4. **Alternative proposal** -Select commercially available skin care products that have passed the safety test (check “makeup font size” or "Medicine quasi font size”) -Physical therapy: cold compresses to relieve itching, ultraviolet treatment requires professional equipment Please be sure to take medical safety as your primary consideration. Delays in formal treatment of skin problems may cause the condition to worsen. If you have further questions, it is recommended to consult your local pharmacist or medical institution with a specific symptom description.