Development of a Global Subjective Skin Aging Assessment score from the perspective of dermatologists.

Of 213 randomly selected dermatologists, 145 responded to the survey. EFA revealed 3 important factors related to skin aging: Factor 1 comprised 8 signs related to atrophy (deep/superficial wrinkles, eye bags, lax appearance, etc.); Factor 2 comprised 7 signs related to discoloration (freckles, lentigines, melasma, etc.); and Factor 3 comprised 3 malignant skin lesions. The Global Subjective Skin Aging Assessment (GS2A2) score is a simple numerical score that can be used to evaluate the anti-aging effects of a cosmetic product or dermatologic intervention. This score should be tested further for validity and reliability.