Is the branch of medicine dealing with the skin, nails, hair (functions & structures) and its diseases, It is a specialty with both medical and surgical aspects. A dermatologist is specialist doctor that manages diseases, in the widest sense, and some cosmetic problems of the skin,
Injectable filler (injectable cosmetic filler, injectable facial filler) is a soft tissue filler injected into the skin to help fill in facial wrinkle, restoring a smoother appearance. Most of these wrinkle fillers are temporary because they are eventually absorbed by the body. Some people may need more than one injection to achieve the wrinkle-smoothing effect. The effect lasts for about nine months or longer. Successful results depend on health of the skin, skill of the health care provider, and type of filler used. Fillers are made of sugar molecules or composed of hyaluronic acids ,collagens - which may come from pigs, cows, cadavers, or may be generated in a laboratory the person's own transplanted fat, and biosynthetic polymers. Examples of the latter include calcium hydroxyapatites, polycaprolactone , polymethylmethacrylate, and polylactic acid.