This case report documents the rapid onset of balanoposthitis in a 58‐year‐old male patient diagnosed with type 2 diabetes mellitus just 2 weeks prior. The patient presented with acute penile pain, swelling, and purulent discharge, necessitating circumcision due to balanoposthitis and phimosis. The diagnosis of type 2 diabetes mellitus 14 days prior highlights the potential for rapid development of balanoposthitis despite practicing proper hygiene. This underscores the importance of healthcare practitioners proactively examining the penile area in newly diagnosed diabetic patients to prevent balanoposthitis and, conversely, screening patients with balanoposthitis for type 2 diabetes mellitus.