Colloid degeneration of the skin--a case report.

A patient with multiple nodules on the chin and scalp is presented. Histologically, the nodules were composed of amorphous materials which also completely filled up the whole dermis. Histochemical observation indicated that the amorphous material in the nodule was a kind of glycoprotein. Electron microscopic examination revealed that the material consists of short wavy fibrils, 60 to 100 A in diameter, and of a low electron-dense amorphous substance. Biochemical examination supported the view that the amorphous material is so-called sialomucoid. The nodules were finally diagnosed as colloid degeneration of the skin (nodular type).