Diabetes is one of the most common disease over the world which requires a daily self-care in order to be controlled. Nowadays, diabetes self-management can benefit from the recent advanced technologies such as Internet of things (wearables and medical sensors) to take measurements and track health data. In this paper, we present a platform architecture based on the IoT and Blockchain to facilitate the follow-up of diabetes and to help patients to self-manage it properly. Our architecture combines the IoT with the Blockchain technology in order to collect patients' data, share it with their healthcare teams in a near real-time and in a secure manner while preserving patient's privacy.