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In some cases molluscum fibrosum is associated with pigmentation of the skin and with multiple tumours of the nerve-trunks. The small multiple tumours rarely call for interference. [Illustration: FIG.
Such epidermic anomalies as ichthyosis, scleroderma, and molluscum simplex, sometimes appearing shortly after birth, but generally seen later in life, will be spoken of in the chapter on Anomalous Skin Diseases. Human horns are anomalous outgrowths from the skin and are far more frequent than ordinarily supposed. Nearly all the older writers cite examples.
Multiple fibromata of the skin sometimes occur in enormous numbers and cover the whole surface of the body; they are often accompanied by pendulous tumors of enormous size. Virchow called such tumors fibroma molluscum. Pode mentions a somewhat similar case in a man of fifty-six, under the care of Thom.
Duyse reports a case of extensive hypertrichosis of the back in a girl aged nine years; her teeth were normal; there was pigmentation of the back and numerous pigmentary nevi on the face. Below each scapula there were tumors of the nature of fibroma molluscum. In addition to hairy nevi on the other parts of the body there was localized ichthyosis. Schulz first observed the patient in 1878.
The skin of the large hairy naevus, as well as that of the smaller ones, was stated by Schulz to have been in the main thickened, in part uneven, verrucose, from very light to intensely dark brown in color; the consistency of the larger mammiform and smaller tumors soft, doughy, and elastic. The case was really one of large congenital naevus pilosus and fibroma molluscum combined.
It is met with also in the subcutaneous and intermuscular cellular tissue, and in the abdominal wall, where it sometimes attains considerable dimensions. Various forms of fibroma are met with in the mamma and are described with diseases of that organ. The fibrous overgrowths in the skin, known as keloid and molluscum fibrosum, and those met with in the sheaths of nerves, are described elsewhere.
The multiple, soft fibroma known as molluscum fibrosum, which depends upon a neuro-fibromatosis of the cutaneous nerves, is described with the tumours of nerves. The "painful subcutaneous nodule" is a solitary fibroma related to one of the cutaneous nerves. The hard fibroma known as keloid is described with the affections of scars.
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