1. A device of guiding a dermatologic care process in multiple skin areas, comprising: a carrier adapted to support a drive of a dermatologic care tool over a skin area while said dermatologic care tool intermittently performs a plurality of dermatologic care sessions each in one of a plurality of skin subareas of said skin area by emitting at least one pulse of treatment light for performing said dermatologic care session; a treatment light detector which generates a signal indicative of detection of at least one of a start and an end of each said dermatologic care session by detecting said at least one pulse of treatment light having energy for performing said dermatologic care session; and a brake unit configured to operate according to said signal from said treatment light detector, said break unit configured to regulate a movement of said carrier in response to said signal to guide said dermatologic care tool from being placed to perform a first of said plurality of dermatologic care sessions to a first of said plurality of skin subareas to being placed to perform a second of said plurality of dermatologic care sessions to a second of said plurality of skin subareas during said drive; wherein said dermatologic care tool and said light detector are electronically disconnected during said dermatologic care session such that said treatment light operates independently from said device.