The medical-aesthetic treatment is done by collagen injections; and the substance to the deeper layers of the skin is provided. The fact that it is an equal, or nearly equal to the natural minimizes component rejection because just being absorbed by the body without complications Elliskin . A month before the definitive treatment doctors must take a test to rule out allergic reactions. To do inject a small sample of the product (the size of a pea) in the forearm. If redness or other unwanted effects do not occur, they are performed infiltrations in the desired areas. Only 3% of people have an allergy to collagen. Since collagen injections pierce the epidermis are not talking about a cosmetic treatment, but a medical practice. Anything that involves injections, mesotherapy, scalpel, cuts, etc. It must be applied by a licensed physician. The advantages of this technique is that it is minimally invasive, the treatment is a matter of minutes, the effect is immediate, recovery is very rapid and, typically, the side effects are maximum puncture derivatives: redness or inflammation that mitigated in hours or a few days.