There are several reasons for the development of eye circles as one gets older. The main causes are a decrease in subcutaneous fatty tissue in the lower eyelids and reduced thickness of the bone in the margins of the eye sockets. A "tear trough" forms in the mid-region of the lower rim of the eye socket, and the tissue tends to sink in on the sides. Both of these processes result in sunken eyes with dark circles, which may make you look tired and listless.
However, under-eye circles can be treated with a filler. This treatment is particularly gentle, because we use very fine, rounded-tip cannulas instead of ordinary injection needles. The treatment is practically painless, and you can resume your normal activities afterwards.