The dermatosis described over 40 years ago by Sulzberger and Garbe is still beiig seen and is still withotjt known cause, aetiology or pathogenctic mechanism. Its kaleidoscopic changes in clinical appearance cause it to mimic many other dermatoses. But in typical cases it can be recognized by an assemblage of clinical and histopathological characteristics and distinguished from other known dermatoses. Modern techniques may shed light upon its causal mechanism and either establish it as an entity or place it in nosological perspective.