Top layers of skin are scraped with a high speed rotary wheel to soften acne scars and remove fine wrinkles. Recovery: Back to work in two weeks; strenuous activities are possible after four to six weeks. Redness fades after about three months. Temporary tingling, itching, swelling, redness, skin lightening. Acute sensitivity to sun. Comment: Avoid direct sunlight for six to 12 months while pigmentation returns. Risks: Permanent color changes, infection, scarring, flare-up of skin allergies, fever blisters, cold sores. Permanence: For life, but new wrinkles may form.