Merkel cell carcinoma: Solitary, fast growing, asymptomatic, red, firm, shifting, smooth lump with atrophic surface; the appearance in the area of UV-exposed areas is characteristic.
Kaposi's sarcoma. 37-year-old man infected with HIV has some circumscribed, symptomless, red plaques in the area of the nose. development within one month. conspicuous follicular accentuation in the lesions. smooth skin surface, no scaling. similar skin changes still exist on palmae and plantae as well as on the glans penis. development within one month.
Lymphoma cutaneous NK/T-cell lymphoma nasal type: ulcer covered with red granulation tissue and crusts that has been expanding for months with partial destruction of the nasal septum.
Nodular basal cell carcinoma in Xeroderma pigmentosum: solitary, broadly based, firm, painless, centrally ulcerated nodule. On the edge of the basal cell carcinoma-typical shiny margin. Note: the extensive scarring is a consequence of the underlying disease.
Hidrocystoma: General view: For about 2-3 years, formation of disseminated, colorless, painless, 0.1-0.3 cm large nodules on the bridge of the nose; 12-year-old patient.
Basal cell carcinoma, nodular: centrally ulcerated nodular tumor with clear wall at the edge, ulcer not painful, characteristic for the diagnosis "basal cell carcinoma" is the raised, reflecting wall at the edge of the ulcer.
Keratoakanthoma, classic type: short term, grown within a few weeks, about 1.8 cm in diameter, hard, reddish, central keratotic nodule with bizarre telangiectasias on the surface, in a 71-year-old female patient.
Basal cell carcinoma pigmented: slowly growing, centrally ulcerated, completely asymptomatic lump on the nostril; the smooth and shiny wall of the nasal margin is characteristic of the carcinoma, where bizarre vascular structures are also visible
Keratoakanthoma, classic type: hard, reddish, central keratotic lump, measuring about 2.0 cm in diameter, grown within a few weeks DD: squamous cell carcinoma.
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