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Yaws

Yaws Yaws is a chronic infectious disease caused by the spirochete Treponema pallidum subspecies pertenue. Yaws has a global distribution in tropical regions. Once very common, it has much succumbed to eradication campaigns. It remains active in remote areas of poor tropical nations. Yaws is transm ...

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Xanthoma plane

Plane xanthoma Plane xanthomas are yellowish macules, patches, and occasionally patches. Generalized plane xanthomas can be caused by a myelodysplasia, such as multiple myeloma or macroglobulinemia. Palmar plane xanthomas are characteristic of type III hyperlipoproteinemia with elevated cholestero ...

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Xeroderma pigmentosum

Xeroderma pigmentosum Xeroderma pigmentosum is an autosomal recessive disease characterized by photosensitivity, pigmentary changes, skin neoplasms, and premature aging of the skin. It is attributable to abnormal DNA repair. Eight genes have been identified as important to the repair of ultraviole ...

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Xanthoma

Xanthoma Xanthomas are caused by the deposition of the lipids in dermal macrophages, forming yellow-pink lesions visible to the eye. They are associated with hyperlipidemia.

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wood's light

Wood's light Wood's light is light in the UVA1 part of the spectrum near 365 nanometers. This ultraviolet light can cause fluorescence in Corynebacterium minutissimum (erythrasma) and in various fungi and yeast infections. Pityrosporum species, the cause of tinea versicolor, show a yellow fluoresc ...

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Xanthelasma

Xanthelasma Synonym: Xanthelasma palpebrarum Periocular xanthoma Xanthelasma is a soft, superficial, yellow-orange papule, most common on the medial upper eyelid. Usually multiple and often symmetrical in distribution, lesions can occur in normolipemic individuals. However, they are of considera ...

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X-linked recessive ichthyosis

X-linked recessive ichthyosis This recessive disorder, X-linked ichthyosis, is found in males. Clinically seen as a more severe variant of ichthyosis vulgaris, with relative but not complete sparing of the flexures, it commonly shows thickened brown scales. The palms and soles may show some hyperk ...

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White sponge nevus

White sponge nevus White sponge nevus is an autosomal dominant trait where the mucosa is thickened and folded into white plaques. Gingival margins are rarely involved. White sponge nevus is not premalignant. It is important to differentiate these lesions from dysplastic leukoplakia. Treatment: N ...

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Whitehead

Milium mil'e-um) pl. milia (mil'ia) (Latin. Milium - millet seed) A milium is a tiny, white cyst containing lamellated keratin. A milium is a small, subepidermal keratin cyst that appears as a white subcutaneous nodule. It is rarely more than 2 mm in diameter. Most commonly on the face, it can a ...

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Wheal

Wheal (definition) (hwel) (weal) (Anglosaxon) An elevated white or pink compressible, evanescent papule or plaque produced by dermal edema. A red, axon-mediated flare often surrounds it.

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