Gottron's papules are skin findings most specifically associated with which condition?

• A. Rheumatoid arthritis
• B. Systemic lupus erythematosus
• C. Dermatomyositis
• D. Psoriasis

Answer: (C)

Gottron's papules are pathognomonic for dermatomyositis, a condition that combines inflammatory muscle weakness with distinctive skin findings. These violaceous, raised or flat papules sit on the dorsal (extensor) surfaces of the hands, especially over the knuckles, and they strongly point to dermatomyositis when seen with proximal muscle weakness and elevated muscle enzymes. This skin feature is not typical of rheumatoid arthritis, which centers on joint deformities and rheumatoid nodules; systemic lupus erythematosus, which features malar rash and photosensitive eruptions; or psoriasis, which presents with silvery plaques and nail changes. The presence of Gottron's papules thus most specifically indicates dermatomyositis.