Acne fulminans presents with sudden onset of painful, ulcerative nodules and plaques, often leading to severe scarring. Patients may also experience systemic symptoms like fever, joint pain (arthralgia), muscle pain (myalgia), and a general feeling of malaise. Diagnosis typically involves a thorough clinical evaluation, including a detailed medical history and physical examination. Blood tests may reveal elevated inflammatory markers such as ESR and CRP. Imaging studies, like X-rays, can help assess bone involvement in severe cases. Early diagnosis is essential to prevent complications and initiate appropriate treatment promptly.