Dermatomyositis (V-sign): Characteristic cutaneous symptoms of the backs of hands and fingers, almost proving the diagnosis of "collagenosis", with reddish-livid papules arranged in stripes, which merge to form flat plaques in the area of the end phalanges. Painful nail fold keratoses with parungual erythema are sometimes seen. Such papules arranged on the stretching side are also found in SLE and mixed collagenosis, rarely once in lichen planus.
Systemic lupus erythematosus (late onset): characteristic "collagenosis hands" with variable blue-red and livid-red patches. 83-year-old patient with known (since several years proven) systemic lupus erythematosus.
Lichen simplex chronicus. approx. 3 x 5 cm large, itchy plaque with rough surface on the ventro-medial right lower leg of a 14-year-old female patient. In the surrounding area distinct scratch artefacts and also follicularly bound papules. In case of stress worsening; during stays at sea improvement of the findings.
erythema exsudativum multiforme. suddenly appeared, since 4 days existing, itchy, disseminated exanthema with cocard-like plaques. the skin changes appeared shortly after the beginning of antibiotic therapy for urinary tract infection. here the finding on the back of the hand. s. isomorphism (koebner phenomenon).
Candida granuloma: Recurrence at the forearm extensor side in a 28-year-old patient 1 year after complete regression of the granulomas under antifungal systemic therapy.
Dermatomyositis (overview): Striped arrangement of red papules and plaques, which confluent to flat areas in the area of the end phalanges; strongly pronounced nail fold capillaries.
Psoriasis guttata: de novo occurred, 0.1-2.0 cm large, reddish, rough papules and plaques with fine-lamellar scaling in a 26-year-old woman, preceded by a feverish flu-like infection.
Psoriasis arthropathica: single (only on the thumb), complete, crumbly onychodystrophy (psoriatic crumb nail) Massive swelling and redness of the entire thumb, infestation of the joints in the ray (so-called sausage fingers).
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