Potassium iodide in erythema nodosum and other erythematous dermatoses.

Potassium iodide therapy has a history of more than 150 years. It has been tried in many diseases in the past. However, with the development of modern medications indications for potassium iodide therapy are very limited. It is well known that potassium iodide is the drug of choice for sporotrichosis. Subacute nodular migratory panniculitis and erythema nodosum have also been treated successfully with this drug.