. A practical treatise on diseases of the skin, for the use of students and practitioners. usually single and iso-lated, though hundreds may appear upon the person of one consist of semifluid collections derived from that portion of therete which either lines the sebaceous glands or penetrates between the 1 International Atlas of Rare Skin Diseases, i. 1890. HYPERTROPHIES. 429 papillae of the derma; or they are actual transformations of the glandsinto cornified amorphous deposits, surrounded by thickened may artificially be removed; or be shed spontaneously; or in
. A practical treatise on diseases of the skin, for the use of students and practitioners. usually single and iso-lated, though hundreds may appear upon the person of one consist of semifluid collections derived from that portion of therete which either lines the sebaceous glands or penetrates between the 1 International Atlas of Rare Skin Diseases, i. 1890. HYPERTROPHIES. 429 papillae of the derma; or they are actual transformations of the glandsinto cornified amorphous deposits, surrounded by thickened may artificially be removed; or be shed spontaneously; or inflame,and result in circumscribed abscesses; or terminate by often they are insidious and slow of development, and may per-sist for years without producing annoyance or subjective occur on the face, the side of the neck (Fig. 49), and the nucha;on the penis and scrotum of men, and the breasts and labia of women;on the trunk; on the flexor surfaces of the extremities, and the dorsalsurfaces of the hands and feet. They are most common in children. Fig. Molluscum epitheliale. (After Allen.) In consequence of the depression of the centre of the little tumors(which Hutchinson has aptly likened to small pearl buttons) they maysuggest the lesions of variola, hence they were described by Bazinunder the term Varioliform acne. This title, however, is by mostwriters employed to designate a totally different affection, a variety ofacne vulgaris, to which a chapter is devoted in this work. Hebra, Virchow, and Nicolaysen have reported colossal mollusca,as large as an orange or a small cocoanut. Microscopical examinationof these gigantic lesions demonstrated their identity with the smallertumors. Similar bodies of less size have been found interspersed amongepitheliomata. Etiology. In England, where the disease was first recognized andwhere, according to Hutchinson, it is far more frequent than on the 430 DISEASES OF THE SKIN. continent of Europe, the belie
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