A method of controlling an operation of a portable skin treatment device, the method including: if a control button of the treatment device is pressed, heating a heater to prepare heating of a tip of the treatment device in a predetermined temperature range and if heating of the tip is completed, turning on a light source disposed inside a housing of the treatment device and performing light irradiation treatment of irradiating light onto the skin through the tip together with heat. By using the method of controlling the operation of the portable skin treatment device by applying heat to the skin area of a disease of sebaceous glands such as acne etc. or itch and by irradiating light onto the skin area, treatment effects can be improved, and the fact that a user is getting treatment can be more realistically recognized.
