Top 10 most popular cosmetic procedures in U.S. – Nonsurgical – 2. Hyaluronic acid

Number of procedures in 2011: 1,206,186
Hyaluronic acid includes a class of soft tissue fillers used to treat wrinkles or facial aging. The compound is injected into the skin – results last for 3 months in “high mobility” areas such as the lips, and up to a year for “smile lines” around the nose. Risks include bruising, lumpiness, redness, and in rare cases local infections.