IDENTIFYING A BODY PART

There is provided a computer-implemented method of identifying a body part of a subject on which a hand-held personal care device is used. The hand-held device comprises a head portion for contacting skin of the subject during the personal care operation. The hand-held device further comprises one or more sensors for measuring a respective parameter and generating respective measurement signals as the hand-held device is used on the skin of the subject, and the one or more sensors comprises at least one of (a) a skin contact sensor, (b) a skin tone sensor, and (c) a proximity sensor. The method comprises: analysing the obtained one or more measurement signals using a trained machine learning model, MLM, to identify the body part of the subject that the hand-held device is used on; and outputting an indication of the identified body part.