chronic paronychia: existing for months (physiological growth of the fingernail about 0.10 to 0.12 mm per day), slightly painful paronychia with growth disturbances of the nails. nail fold (encircled) reddened and swollen. moderate pain under pressure. from time to time a purulent secretion empties under pressure. cuticles completely missing.
Elastoidosis cutanea nodularis et cystica: multiple, chronic inpatient, 0.4 - 1.2 cm large, symptomless, soft, yellowish papules and nodules; black comedones in the temporal region. 72-year-old man with massive chronic UV exposure over decades.
Squamous cell carcinoma of the skin: large, painless plaque with a sharply defined proximal border, with extensive horny and crusty deposits; the finding has existed for several years.
Xanthogranuloma juveniles (sensu strictu). soft elastic, yellowish, completely asymptomatic, hardly elevated plaques. no Darier's sign! 10-month-old female infant with multiple xanthogranulomas. size growth in the first months of life.
onycholysis drug-induced or light-induced: known porphyrias cutanea tarda. onycholysis without any trauma (no subungual bleeding detectable) with known high light sensitivity. onycholysis in this case is to be considered as a summation effect.
Pyoderma: acute, painful raised areas filled with yellow fluid (pustules) with central hair and surrounding erythema; isolated and aggregated follicular pustules in staphylococcal infection of the skin (follicular pyoderma).
impetigo contagiosa. skin changes existing since three weeks. beginning at the lateral half of the chin, continuous spreading. pre-treatment with corticosteroids! greasy yellow crusts on a flat redness. in the marginal area honey yellow, flat pustules with secretion accumulation. surrounding tender erythema.
Keloid. chronically stationary clinical picture. multiple, linear, skin-coloured smooth plaques that appear in the area of a tattoo and follow the given pattern.
Squamous cell carcinoma of the skin: hyperkeratotic, sharply defined red nodule which is painful under lateral pressure; histological: highly differentiated, spinocellular carcinoma
Pseudoxanthoma elasticum: Dermatoscopic picture of the right neck with translucent, yellowish-white solitary and also confluent "cotton-wool-like" discolorations which correspond to the elastotic collagen alterations of the dermis.
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