Abstract: Disclosed is a portable IR device for the treatment of skin. The device comprises a handle, a light-emitting assembly including one or more replaceable light-emitting elements formed of either the same LED for emitting IR rays of a predetermined wavelength or different LEDs for emitting IR rays of different wavelengths, and a controller assembly coupled to the light-emitting assembly for controlling irradiation time, wavelength of IR rays, and light-emitting mode of each light-emitting element. Holding the handle and activating the device will cause the light-emitting elements to emit IR rays for treating the skin in close proximity therewith.