To be eligible for Bellafill, patients must be 21 or older and receive the required skin test prior to treatment. In clinical studies, Bellafill was shown to work in both men and women with a variety of skin types. If you have a history of severe allergies, are allergic to bovine collagen, are allergic to lidocaine, have a bleeding disorder, or are prone to irregular scarring, let your doctor know prior to your treatment. For a full list of contraindications, contact your doctor or check out our instructions for use.