Pemphigoid gestationis. itchy, since 4 weeks existing exanthema with multiple, generalized, symmetric, truncated, large red plaques with isolated, bulging blisters. picture reminds of an erythema exsudativum multiforme.
Erythema perstans faciei. persistent, butterfly-shaped, livid red erythema in a 3-year-old boy with vitium cordis (pulmonary stenosis, subaortic stenosis, vascular transport and ventricular septal defect).
AIN. Anal dysplasia. Large, hyperkeratotic area with smaller satellite lesions. The surface is granular and shows different areas of keratinization. Histologically, there was a grade 2 intraepithelial neoplasia.
Lichen planus verrucosus: a hypertrophic lichen planus with pseudoepitheliomatous epithelial hypertrophy and scarring that has been present for several years.
Primary cutaneous follicular center lymphoma: chronically active, increasing for 12 months, localized on the trunk and upper extremities, disseminated, 0.3-0.7 cm in size, asymptomatic, hemispherical, firm, smooth, red papules and nodes.
Lichen planus. overview with pathognomic fine-tissue architecture of the LP. ligamentous (not reaching into the deeper parts of the dermis) lymphocytic infiltrate which is "crowded" closely to the epithelium. moderate, continuous acanthosis and hypergranulosis as well as severe orthohyperkeratosis. in the right section of the picture distinct cleft formation in the area of the dermo-epidermal junction zone.
Dermatitis herpetiformis: chronically recurrent course of the disease. persists for about 3 years. disseminated, burning, partly also stinging urticarial papules, papulo vesicles and erosions.
Pityriasis rosea: Collerette scaling: For Pityriasis rosea pathognomonic form of scaling with exactly one ring of fine, slightly raised, whitish scaling about 1-2mm indented from the lateral edge of the reddish plaque.
Note: this form of "keratolytic" desquamation results from the repulsion of superficial, parakeratotic horn lamellae.
Tinea barbae. scaly, blurred, itchy erythema (incipient plaques) on the cheek and upper lip. erythema areas are sparsely interspersed with follicular papules and pustules.
Gout: suddenly occurring painful monarthritis of the metatarsophalangeal joint of the big toe with distinct swelling and redness. also painfulness due to pressure
rosacea. rosacea erythematosa, stage I of rosacea with individual inflammatory papules and pustules. flat, relatively sharply defined, symmetrical erythema (plaque) of the cheeks with clear protrusion of the follicles (skin pores). no comedones. perioral area remaining free. redness is now permanently present after earlier volatility but with varying intensity. at the same time, a feeling of tension and a slight burning sensation with shearing activity.
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