Carsten has worked as a specialist in Brønderslev Skin Clinic since 2010. Before this, he worked as a researcher in Denmark and West Africa. Carsten is a highly skilled dermatologist and a popular speaker worldwide in his field. He has published over 130 professional articles, some of which he co-wrote with Kristian Bakke Arvesen. Carsten has worked as a regional doctor in Greenland, as well as a chief physician at several hospitals in Norway.