The number terms required designate the distinct affections are very few, and pleasing see that Prof.
Hebra has, instead introducing new, given some the old titles in connection with these affections.
let Class, Hypertrophies, The simplest deviation in this direction from the normal condition the pigment its development in excess upon such parts the skin many persons as are exposed the weather, which call tan. It not exclusively the direct rays the sun that the exciting agent in this change, for a few hours exposure sea-air and fog, even when the sun obscured, will produce a marked alteration color upon some, and there seems a difference tint in the faces the sailor and the out-door laborer shore. It astonishing how rapidly and how great an extent the pigment developed in some skins under exposure, as witnessed the necks and arms the fairest oarsmen and ball-players at the end the season a few months only being sufficient develop a hue as swarthy as that the darkest Latin nations, and suggesting what cycles a tropical sun and accumulative transmissibility might and may have done, in painting the various college term papers for sale races mankind. Tan and sunburn are two distinct processes, though produced the same cause the latter being a temporary congestion or erythema the skin, and in no way necessarily connected with changes in the pigmentary system. They may occur simultaneously, but often the skin which tans easily does not burn readily. Frequent burning, however, like all congestions, apt develop the deposition coloring matter in the parts over-supplied with blood, according a well-known law. Ordinary tan generally disappears spontaneously in our latitude strong extremes, where the cold overrules the heat, and where all warmth color, both in animal and plant, fades out with departing summer. In our Southern States, peopled the same original Anglo-Saxon stock as ourselves, the hue the skin several shades darker than our own, and the short winters exert but a mild bleaching influence upon There, thesis database too, miscegenation has given ample opportunity studying the effect dilution upon the intense blackness the negro race, and although i will pay you to write my paper a single cross found sufficient diminish this a great extent, requires many successive intermixtures deprive the cells the rete mucosum all their native pigment.
Hebra makes but two simple divisions all the affections marked increase pigment, Lentigines and Chloasmata.
Under the former places those in which the coloring matter appears in the form spots not exceeding a pea in size, upon whatever part the body pay to do they may occur, whether permanent or temporary. Chloasmata, the other hand, are, according his definition, yellow or yellowish-brown patches, in size vaiying from the palm the hand a plate or larger, manifold shape, situated various parts the body, and more or less circumscribed and sharply defined.
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This term chloasma has been used with the widest latitude meaning.
Compare, for instance, the different names applied that variety which frequently affects the forehead women.
Barensprung calls melasma, Elleinhans melasma, Hardy both chloasma and ephelis, Bazin melasma, Neligan ephelia hepatica, Hillier ephelis lentigo, afid Wilsoa both melasma figuratum and chloasma, though the latter means pityriasis versicolor, an entirely distinct and parasitic affection. Prof. Hebra recognizes an idiopathic and a symptomatic chloasma the former three sub-varieties, traumaticum, toxicum, and caloricum and the latter two, uterinum and cachecticorum. These terms, course, imply rather variety in causation than in appearances. Under melasma alludes very briefly darkening the skin more or less universal in extent, such as accompanies seveiul obscure forms disease, as pellagra, sclerosis, morbus Addisoni, With regard the treatment these pigment stains, even those limited extent and tending spontaneous variation, like moth upon the face, one gains but little additional confidence in his power need help with coursework over them after the perusal Hebra's section upon the subject. As the pigment cells are the youngest and deepest the Malpighian layer, evident that their removal local means involves the removal also everything above them. In the selection remedies possessing this property destroying the epidermis calls our writing term paper help attention the fact, that the action some these followed the prodaction an epidermis which contains more pigment than before, while after the action others the newly formed cells contain less than previously. Among the former are croton oil, mustard and cantharides among the latter acetic add, borax, the caustic alkalies and corrosive sublimate. national junior honor society essay help It need scarcely said, then, that our choice will made from the latter, and experience has demonstrated that the last named them the most reliable, mba admission essay writing service whether use as a rapid vesicant or accomplish the same object more graduaXlj dilute solutions, and imperceptible desquamation.
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