Which of the following treatments is commonly used to fill wrinkles?

The treatment commonly used to fill wrinkles is collagen. Collagen is a natural protein in the body that provides structure and support to the skin. As we age, the production of collagen decreases, leading to the formation of wrinkles and fine lines. Injecting collagen fillers into the skin can replenish lost volume, smooth out wrinkles, and enhance overall skin texture. This restorative approach helps to create a more youthful appearance.

In contrast, other treatment options serve different purposes. Exfoliation is aimed at removing dead skin cells and promoting skin turnover, which can improve texture but does not fill wrinkles. A chemical peel is primarily used for deeper skin exfoliation and can improve skin tone and texture but is not specifically a wrinkle-filling treatment. Light therapy involves various light-based techniques for skin rejuvenation, targeting issues like redness or pigmentation, but it does not directly fill in wrinkles. Therefore, collagen is the most appropriate choice for filling wrinkles among the options given.