Our data suggest that BMP-4, beta-catenin, osteopontin, osteonectin and osteocalcin may be involved in the idiopathic cutaneous calcification and ossification. And smooth muscle actin positive mesenchymal cells may be involved in the cutaneous ossification. This study suggests that the idiopathic cutaneous calcification and ossification is highly complicated and regulated active process like ectopic calcification of other tissues.