8. Agree to use only water to wash face and upper chest, avoid using any cosmetic products (include but not limited to: wash/ soap/ moisturizer/ toner/ sparge/ sunscreen/ oil/ (water) mask/ scrub/ makeup/ fragrance/ light treatment/ massage, etc.) in the evening before each visit day. No washing on face and upper chest and no product application at home in the morning of the visit day. Subjects will wash the test areas when arrive the test site according to the site instruction;