Almost a century ago, the relationship of sarcoid infiltrations of the skin and granulomatous changes in other organs was recognised. Schaumann, in 1914, proposed that lupus pernio (fig. 1a–c) could be a manifestation of a generalised disease. Later on, a variety of skin manifestations have been described to occur more or less frequently. Lupus pernio indicates an unfavourable prognosis, wherea...

As the United States comes increasingly closer to being the heaviest nation on earth, many people are turning to exercise, especially running, to lose weight. Most runners, whether novice or professional, will have a skin disorder that may prompt them to seek medical attention. Although case reports and sports reviews have discussed, in a cursory fashion, the nature of these skin lesions, to ou...

Diabetes mellitus can be complicated by a variety of cutaneous manifestations. Good metabolic control may prevent some of these manifestations and may support cure. Unfortunately, most glucose-lowering drugs also have cutaneous side effects. It is important to be able to recognize these signs and symptoms and to either treat them appropriately or refer the patient to a dermatologist or diabetol...