In the past few years since our viewpoint on carbon nanoparticles was first published in 2013 (Kumar, V.; Toffoli, G.; Rizzolio, F. ACS Med. Chem. Lett.2013, 4 (11), 1012-1013), a considerable progress has been made in the area of synthesis, functionalization, and applications of fluorescent carbon nanoparticles (CNPs). This update aims to highlight some key points achieved in the last 4 years in the development of CNPs with a particular emphasis on the approaches to ameliorate clinical applications of CNPs as therapeutics, diagnostics, and theranostics agents.