The metabolic changes associated with diabetes mellitus (DM) affect a variety of organs and systems, including the skin. Skin lesions are frequently observed in patients with DM, resulting from a complex interaction among biochemical, vascular, immune, and metabolic changes. Cutaneous manifestations may develop at any time in the course of DM. They can be the first sign of the disease, possibly helping in diagnosis, or represent a marker of poor glycemic control. Given the high prevalence of cutaneous manifestations in DM, their possible role in favoring DM early diagnosis, and their relationship with the patient's metabolic control, a group of Italian dermatologists and diabetologists, the DiaDex expert group, jointly formulated a few basic statements aimed at favoring a stricter interdisciplinary cooperation in order to improve patients' management. Deeper knowledge of the skin lesions most commonly associated with DM, their early identification, and prompt reciprocal referral, when appropriate, are the pivotal points of these statements and should represent the pillars of such desired cooperation. The dermatologists and diabetologists of the DiaDex group believe that their different diagnostic and therapeutic skills put together may significantly benefit the many DM patients with cutaneous complications and hope that this paper may provide some guidance on how to achieve this goal.