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The "leopard-boy of Africa," so extensively advertised by dime museums over the country, was a well-defined case of leukoderma in a young mulatto, a fitting parallel for the case of ichthyosis styled the "alligator-boy." Leukoderma is more common among females. It is rarely seen in children, being particularly a disease of middle age.
Several cases have been reported in which the specific gravity of the urine was extremely high, due to an excess of urea. Wood calls attention to the wave-like course of leukoderma, receding on one side, increasing on the other. The fading is gradual, and the margins may be abrupt or diffuse. The mucous membranes are rosy. The functions of the swell-glands are unimpaired.
True leukodermic patches show no vascular changes, no infiltration, but a partial obliteration of the rete mucosum. It has been ascribed to syphilis; but syphilitic leukoderma is generally the result of cicatrices following syphilitic ulceration.
Anosmia has been noticed in leukoderma and allied disturbances of pigmentation. Ogle mentions a negro boy in Kentucky whose sense of smell decreased as the leukoderma extended. Influenza, causing adhesions of the posterior pillars of the fauces, has given rise to anosmia. Occasionally overstimulation of the olfactory system may lead to anosmia.
By his experiments on the pigment-cells of a frog Lister has established the relation existing between these elements and innervation, which formerly had been supposititious. Doubtless a solution of the central control of pigmentation would confirm the best theory of the cause of leukoderma i.e., faulty innervation of the skin.
Leukoderma is a pathologic process, the result of which is a deficiency in the normal pigmentation of the skin, and possibly its appendages. Its synonyms are leukopathia, vitiligo, achroma, leukasmus, and chloasma album. In India the disease is called sufaid-korh, meaning white leprosy. It differs from albinism in being an acquired deficiency of pigment, not universal and not affecting the eye.
Many observers have noticed that negroes become several degrees lighter after syphilization; but no definite relation between syphilis and leukoderma has yet been demonstrated in this race. Postmortem examinations of leukodermic persons show no change in the suprarenal capsule, a supposed organ of pigmentation. Climate has no influence.
It is not a dermatitis, as a dermatitis usually causes deposition of pigment. The rays of the sun bronze the skin; mustard, cantharides, and many like irritants cause a dermatitis, which is accompanied by a deposition of pigment. Leukoderma is as common in housemaids as in field-laborers, and is in no way attributable to exposure of sun or wind.
Partial albinism, necessarily congenital, presenting a piebald appearance, must not be confounded with leukoderma, which is rarely seen in the young and which will be described later. Albinism is found in the lower animals, and is exemplified ordinarily by rats, mice, crows, robins, etc. In the Zoologic Garden at Baltimore two years ago was a pair of pure albino opossums.
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