TL;DR
CO2 and erbium are both ablative laser resurfacing treatments that improve skin texture, tone, and signs of aging. CO2 penetrates deeper and works best for advanced concerns like deep wrinkles, acne scars, and significant sun damage, but requires longer recovery. Erbium treats more superficial layers with less heat and faster healing, making it a strong option for fine lines and early aging. The right choice depends on skin concern severity and downtime tolerance.