Dark circles (as well as tear troughs and hollows) are common problems of the lower lids. A variety of methods, including lasers, IPL, chemical peels, and microdermabrasion have been tried with generally disappointing results.
Fillers, on the other hand, have proven quite useful for treating the region under the eyes. It has become standard practice to treat this region with lighter weight fillers, like Juvederm or Restylane, to lift, straighten, and contour this region. Occasionally, if fillers are inadvertently placed too superficially, a bluish discoloration related to light scattering (a phenomenon known as the Tyndall effect) can occur, which can actually make the dark circles more prominent. Belotero Balance, a relatively new hyaluronic acid product, has been manufactured to avoid this. However, I have found that the addition of a tiny amount of Radiesse, a whitish-colored filler, to the Belotero to be an excellent way of lightening the dark circles, and plumping the tear troughs and hollows. However, only an experienced, board certified aesthetic dermatology or plastic surgeon injector should attempt to treat this area in this fashion.