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First and only symptom of undiagnosed diabetes mellitus: eruptive xanthoma. Eruptive xanthoma (EX) is a very rare dermatosis mostly occurring due to high levels of serum triglycerides or uncontrolled diabetes mellitus. When EX is encountered, it is important to keep in mind that it could be a sign of severe underlying metabolic derangements. Early recognition can help avoid serious complications such as pancreatitis. After treatment of the underlying metabolic disorders, lesions mostly disappear without leaving scars. We present a case of a 55-year-old woman who presented with solely EX lesions and who was eventually diagnosed with diabetes mellitus and severe hypertriglyceridaemia.