Bowen, M.: solitary plaque, progressive in size, occasionally accompanied by itching, measuring 1 x 7 cm, sharply and arching, border-emphasized plaque, on the right lumbar side in a 74-year-old woman; a reddish, partly scaly aspect and central fading are impressive.
Plaques muqueuses: disseminated, localised red, symptom-free plaques confluent in the centre of the tongue with preserved papilla structure (see following figure).
Dyskeratosis follicularis: 74-year-old woman. large , hyperkeratotic zones with reddish, partly macerated papules and firmly adhering, partly eroded, confluent keratoses on the capillitium and in the facial area preauricularly, existing since early childhood. the patient has a somewhat neglected appearance. the skin lesions have a foetal odour. the lesions increase with sweating or heat, especially in the warm season.
Dyskeratosis follicularis: Infestation of the palms of the hands; in central areas of the palm flat, common keratoses, at the ball of the thumb about 0.1-0.2 cm large, glassy papules.
Parapsorisis en petites plaques: completely symptom-free red (hardly palpable), slightly scaly plaques; recurrent course for years; improvement in the summer months or under UV therapy.
psoriasis guttata. small, exanthematic form of psoriasis after streptococcal infection. only slight scaling (due to pre-treatment). note the indicated linear patterns (koebner phenomenon). the auspitz phenomenon (finest punctiform bleeding after removal of the uppermost scaly layer with a wooden spatula) can still be triggered even in these pre-treated lesions and is therefore an excellent diagnostic sign (best triggered in the small papules).
Chilblain lupus: in early stage with livid-red, surface smooth, painful plaques. clinical picture reminiscent of chilblain (frostbite lupus). no further systemic signs of lupus erythematosus. hyperkeratotic nail folds.
Dermatitis, seborrhoeic: 62-year-old patient with a negative family history of psoriasis. recurrent HV on the trunk for years. no itching. multiple, chronically inpatient, figured, borderline, sometimes itchy, moderately scaly, clearly borderline hardly elevated plaques.
Kaposi's sarcoma epidemic: Dissemination of the angiosarcoma in the skin. Characteristic arrangement of the foci in the cleavage lines. In places the foci merge into larger plaques.
lupus erythematosus systemic. persistent, sharply defined, symmetrical, non-scaly erythema of the face after exposure to sunlight. known Raynaud's phenomenon. individual enanthema of the oral mucosa (hard palate and cheek mucosa). distinct disturbance of the general condition with arthralgias, fever up to 38° C. typical - butterfly pattern - ("butterfly mask") with free perioral triangle. bridge of nose, upper eyelid and tip of chin are affected.
Psoriasis vulgaris, detail section: Chronic dynamic plaque in the axilla of a 6-year-old girl, occurring in recurrent attacks and existing for 10 days, increasing, solitary, red, rough, covered with cap-like scales.
Poikilodermatic mycosis fuungoides (plaque-type): conspicuous lesional atrophy, which comes close to the clinical aspect of "granulomatous slack skin".
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