Pityriasis versicolor alba. 17-year-old female patient who noticed these white patches after a summer vacation, which became more pronounced as the tan increased. Disseminately distributed (non-symmetrical), 0.2-0.4 cm large, roundish white patches confluent to larger areas (right side of the thorax). The spatter-like distribution pattern is typical for pityriasis versicolor.
Pityriaisis versicolor alba: irregularly distributed, symptomless (slight feeling of tension in the skin) bright spots, which now appeared and were noticed after a sun holiday.
naevus anaemicus: congenital, marginal irregularly dissected, white, smooth spots. no redness after rubbing the spot. on glass spatula pressure the borders to the surrounding area disappear. brown colored, intralesional melanocytic naevi (speaks against vitiligo!)
Vitiligo: spots depigmented with varying degrees of intensity. vertical arrow above: focus in advanced uniform repigmentation. horizontal arrow: uniform but still incomplete repigmentation. vertical arrow below: new roundish focus in older already (incomplete) repigmented area.
Striae cutis distensae, initially blue-reddish (Striae rubrae), later whitish, differently long and wide, jagged, parallel or diverging atrophic stripes with slightly sunken and thinned, transversely folded, smooth skin.
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