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Results for “Pigmentation Disorders”

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PubMed1984

[Bleomycin-induced linear hyperpigmentation].

We describe the progression of bleomycin-induced inflammatory lesions to linear hyperpigmentations in 2 patients. Striking, hitherto unreported observations were the development of streaking after a single dose of 5 mg bleomycin (patient 1) and vacuolar degeneration of melanocytes in the inflammatory stage (patient 2).

Bleomycin↗
PubMedDate not supplied

[Pigmentation and venous stasis].

Local pigmentations can occur in the course of venous diseases and are said to be secondary to venous stasis and due to blood pigment. Most often, the pigment is haemosiderin and more rarely melenin pigments. Haemosiderin is a result of dermal biligenesis of extravasated red blood cells, the erythrodiapedesis being due to alterations in the vessel wall. Melanin pigments remain a mystery. Meaanoid may stimulate dermal melanocytes more than the true melanocytes of neural origin which have migrated to the epidermis. Above all, the problem is dominated by stasis and its microvascular and tissue consequences. The pigmentation is part of the "microangiopathy of stasis", as are the pigmentations occurring after therapeutic sclerosis.

Capillaries↗
PubMed1980

[Ethnic variation in congenital pigmentation anomalies].

Clear ethnic differences are observed in the major form of tyrosinase-negative oculocutaneous albinism as well as in other forms of oculocutaneous albinism, cutaneous albinism and the very rare ocular albinism. Most interesting is the borderline between normal variation and abnormal forms, especially illuminated in rutilism or red headedness in Negroids and high frequencies of pigmentation anomalies without appreciable disadvantages for the carrier, e.g., the reddish skin of geographically isolated Papuans. The very differential frequencies of the occurrence of pigmentation anomalies in some populations are influenced as well by population genetic factors (isolation/inbreeding, founder-effect, heterosis) as also by socio-cultural factors (albinism as a marriage barrier, infanticide), and in some areas perhaps some kind of negative selection in which individuals with the character in question fail to reach reproductive age.

Adolescent↗