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Results for “Pigmentation Disorders”

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At least 883 records · Page 49Linked to original sources
PubMed1987

Minocycline-related cutaneous hyperpigmentation as demonstrated by light microscopy, electron microscopy and X-ray energy spectroscopy.

A 70-year-old patient with a chronic cutaneous ulcer treated by minocycline hydrochloride developed hyperpigmentation of the forearms. Biopsy material was studied by light microscopy, electron microscopy and X-ray energy spectroscopy. Granular gold-brown pigment was found in dermal histiocytes and eccrine myoepithelial cells, which gave positive reaction with Prussian blue and Fontana-Masson stains. Electron microscopy revealed intracytoplasmic granules of dark, homogeneous material and small fine particles. X-ray energy spectroscopy showed iron and other elements in smaller amounts. The different types of minocycline-related hyperpigmentation and the possible pathomechanism are discussed with special regard to the importance of the diagnostic methods.

Aged↗
PubMed1975

A syndrome of hypohidrotic ectodermal dysplasia with normal teeth, peculiar facies, pigmentary disturbances, psychomotor and growth retardation, bilateral nuclear cataract, and other signs.

This paper describes a 7-year-old girl with trichodysplasia, normal teeth, onychogryposis, hypohidrosis, psychomotor and growth retardation, dry and warm skin with follicular hyperkeratosis, pigmentary disturbances (hyper- and hypochromic spots), bilateral nuclear cataract, dermatoglyphic anomalies, and other signs. This condition is considered a new form of ectodermal dysplasia.

Cataract↗
PubMed1991

Familial hypomelanosis of Ito.

Two siblings presented the typical skin changes of hypomelanosis of Ito (HI) associated with mental and cerebellar signs. Their mother showed only the skin changes of HI but no neurological disturbances. HI is a hereditary disorder, in which familiarity may go unnoticed because of the different expressions of neural and cutaneous features.

Adult↗
PubMed1976

Melanin biosynthesis in skin. The redskinned' New Guinean.

A distinctive unique red-toned skin colour found among New Guineans appears to be inherited in an autosomal recessive manner. The red skin colour is associated with red melanin granules within the epidermis, independent of hair bulbs, and described here for the first time. The red skin colour is also associated with smaller melanosome size and apparently diminished transfer of melanosomes from melanocytes to keratinocytes. The chemistry of this skin melanin cannot be elucidate without the availability of more substantial samples or the development of new technology. It does appear to be associated with variation of catechlolamine metabolism as well as a defect of gaze fixation.

Catecholamines↗
PubMed1975

Cutaneous reactions to topical application of hydroquinone. Results of a 6-year investigation.

The investigation was designed to assess the safety of hydroquinone in cosmetic skin-lightening products, and to determine the optimal concentration for the purpose. The 840 volunteers who took part in the 6-year trial were drawn from various race groups with skins varying from very fair to very dark. They were subjected to open tests, "normal usage" tests, and standard 48-hour closed-patch tests. In all, over 7,000 test areas were examined. The results show that concentrations of hydroquinone of 3% and less produced negligible adverse effects, irrespective of the base or the colour of the user's skin. It is stressed that any confusion of hydroquinone with the hazardous monobenzyl ether of of hydroquinone (monobenzone, MBH) should be avoided.

Administration, Topical↗
PubMed1957

[Dyschromia].

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Pigmentation↗