https://medlineplus.gov/ency/imagepages/1866.htm
Dermatomyositis - Gottron's papules on the hand: MedlinePlus Medical Encyclopedia Image
This violet-colored inflammation (erythema) over the knuckles is caused by Dermatomyositis. Other skin conditions produce more redness, while the color of this...
gottron s papulesthe handmedical encyclopediadermatomyositis