The present invention relates to apparatus for topical application of material for cosmetic or medical purposes. The apparatus comprises measurement apparatus (154), (156), (158), (152) configured to measure a property of skin of a human or animal 5 subject,actuating apparatus (146), (148), (152) configured to change a property of the skin of the human or animal subject and application apparatus (162) configured to apply material for cosmetic or medical purposes to the skin. The apparatus further comprises a processor (132) which is configured: to receive operational data based on data received from each of plural other apparatus for topical application of material, (10) said received operational data pertaining to operation of the other apparatus for topical application of material and to control the apparatus for topical application of material in dependence on the property measured by the measurement apparatus and the operational data.
