Papulonodular mucinosis associated with systemic lupus erythematosus: Cutaneous lupus mucinosis

Cutanenous lupus mucinosis is a rare variant of lupus erythematosus eruptions. A 36-year-old female presented with a 1-year history of 1-2 cm sized, skin colored, multiple nodules on the back. She had previously been diagnosed as having systemic lupus erythematosus 10 years ago. A complete blood count showed lymphopenia. Antinuclear antibodies (ANA) were positive at a titer of 1:640. Anti-Sm and ds-DNA were also positive. Histopathological findings showed that the collagen fibers in the upper dermis were loosely arranged and separated by amorphous materials. These materials were all positive for alcian blue staining. This case is compatible with cutaneous lupus mucinosis.