Around one percent of people in industrialised countries will suffer from a leg ulcer at some time. The majority of these leg ulcers are due to problems in the veins, resulting in an accumulation of blood in the legs. Leg ulcers arising from venous problems are called venous (varicose or stasis) ulcers. The main treatment is a firm compression garment (bandage or stocking) in order to help the blood return back up the leg. Compression, however, does not heal all ulcers, and other treatments, such as the local application of energy from low-level lasers, are sometimes used. It is unclear whether low-level laser therapy accelerates the healing of venous leg ulcers, and if it does, whether any particular treatment regimen is optimal.