The most serious consequence of acne is the legacy of scarring of varying degrees, more than 80% of which are depressed scarring. This leaves many patients with orange peel-like changes in their facial skin, no elasticity, and unnatural expressions; female patients lose the beauty of a polished and delicate face. There are various treatments for acne scarring, among which CO2 fractional laser is the gold standard of treatment. With the rapid development of technology, we have the latest ultra-pulsed CO2 fractional laser. The ultra-pulsed CO2 fractional laser is a minimally invasive laser that releases energy in a fractional format, emitting a hair-thin, matrix-arranged laser with high energy, accuracy, and minimal damage, which can instantly penetrate into the dermis and instantly vaporize scar tissue, initiating a series of skin repair responses such as tissue re-healing, collagen synthesis and rearrangement. Advantages: Best efficacy.