<unk>  is caused by genetic and environmental factors. Mutations in HLA genes seem to play a crucial role in the pathogenesis of some cases; likewise silica, aromatic and chlorinated solvents, ketones, trichloroethylene, welding fumes, and white spirits exposure seems to contribute to the condition in a small proportion of affected persons.
Scleroderma
Mixed connective tissue disease
Chyloderma
Dermatomyositis
Anetoderma
Polymyositis
Xeroderma
Lupus