Laser hair removal businesses use concentrated light energy to reduce unwanted hair on the face or body. Treatments are commonly offered for areas such as the legs, underarms, bikini line, back, chest and upper lip. Equipment may use different types of laser or intense pulsed light (IPL); these technologies are not identical, and the appropriate option depends on factors including skin tone, hair colour and the area being treated. Customers can generally expect an initial consultation to discuss medical history, treatment aims, skin and hair characteristics, and any potential risks. A patch test may be carried out before a course begins. Several sessions are usually needed because hair responds best at particular stages of its growth cycle, with appointments spaced over time. Results vary, and treatment is generally described as long-term hair reduction rather than guaranteed permanent removal.