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Colloid and elastic fibre: ultrastructural study on the histogenesis of colloid milium.

Tissues peripheral to well-developed papules of colloid milium were chosen for biopsy and electron microscopy examination. Evidence was presented that colloid is derived from elastic fibres through sequential degenerative change. In the upper to middle dermis of the peripheral tissue, a number of abnormal masses in the vicinity of small colloid depositions were observed. Ultrastructurally, those abnormal masses were degenerating elastic fibres in which "electron-dense layers" of normal elastic fibre increased in amount, although their electron density diminished. Electron-light layers were gradually diminished in quantity. Degenerated elastic fibres finally became granulo-fibrillar and were indistinguishable from colloid. Many fibrils which closely resembled 10 nm tubular microfibrils of normal elastic fibre were observed in the granulo-fibrillar substance. Since one stage of the degeneration of elastic fibre which eventually leads to the formation of colloid milium was very similar to that of actinic elastosis, a direct role of sunlight in the formation of colloid milium is suggested.

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