Collagen injections are used in treating fine lines and wrinkles, as well as shallow scar tissue. Most often, collagen injections treat areas around the mouth, like laugh lines and deep nasolabial creases. Two types of collagen are used, depending on the area to be treated, human and bovine collagen. Bovine collagen requires an allergy test (97% of people are able to be treated) and human replacement collagen treatment can be done right away. Collagen replacement therapy takes around 40 minutes and top-ups are usually required 2-3 times per year.