Gottron's sign is a pathognomoniccutaneous manifestation associated with dermatomyositis (DM), which is an inflammatory disorder affecting the skin and muscles.[1] The primary lesion of dermatomyositis appears as a violaceous, macular erythema with a symmetric distribution, which may progress and become poikilodermatous (atrophic with telangiectasia and pigmentary changes) and indurated (as a result of mucin deposition).[2]
Файл:Dermatomyositis2.jpgGottron's papules. Erythematous to violaceous raised papules overlying the metacarpal and interphalangeal joints in a patient with juvenile dermatomyositis.
Gottron's papules are violaceous erythematous papules that commonly occur overlying the dorsal interphalangeal (DIP) or metacarpophalangeal joints (MCP), as well as the elbows or knee joints. They are found in approximately 70 percent of patients diagnosed with dermatomyositis.[2][3][4][5][6]
Gottron's sign
Gottron's sign are erythematous or violaceous macules or plaques overlying the elbows and/or knees and are considered to be less specific finding for DM.[7] They follow the same symmetric distribution pattern as Gottron’s papules but do not appear in the interphalangeal spaces. This is a contrasting dermatologic distribution pattern to what is observed in patients with systemic lupus erythematosus.[2][8][5][6]
