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Head and Neck Skin Ulcers - Differential Diagnosis Algorithm Neoplastic: • Squamous cell carcinoma • Basal cell carcinoma • Melanoma Metabolic: • Pyoderma gangrenosum Vascular: • Wegner's granulomatosis • Radiation #Head #Neck #Ulcers #ulcerative #skinrash #dermatology #Differential #Diagnosis #Algorithm #causes