Around the body, there are proteins formed in collegenous connective tissues that hold the subcoutane tissues together and strengten the skin around the region. Excess fat helps for strengtening the skin as well. In some cases, the protein structures of the colleagen structures fail. Thus, some problems may occur.
Dark circles under the eyes are discoloration under the eyes that occur when the veins around the under eye are seen more obviously, due to the lack of subcutaneous adipose tissue and looseness of the connective tissue, usually more observed in advanced age.