Auspitz's sign

Auspitz's sign is the appearance of punctate bleeding spots when psoriasis scales are scraped off, named after Heinrich Auspitz.[1] This happens because there is thinning of the epidermal layer overlying the tips of the dermal papillae and blood vessels within the papillae are dilated and tortuous, which bleed readily when the scale is removed.[2]

References

Auspitz' symptom at Who Named It?
Kumar; et al. (2010). Robbin's Text book of Pathology. New Delhi: Elsevier. p. 841. ISBN 978-81-312-1036-9.

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[1] Auspitz' symptom at Who Named It?

[Robbins-2] Kumar; et al. (2010). Robbin's Text book of Pathology. New Delhi: Elsevier. p. 841. ISBN 978-81-312-1036-9.

Symptoms and signs: skin and subcutaneous tissue (R20–R23, 782)
Disturbances of skin sensation	Hypoesthesia Paresthesia Formication Hyperesthesia Hypoalgesia Hyperalgesia
Circulation	Cyanosis Pallor/Livedo Livedo reticularis Flushing Petechia
Edema	Peripheral edema Anasarca
Other	Rash Desquamation Induration Diaphoresis Mass Neck mass
Skin	Asboe-Hansen sign Auspitz's sign Borsari's sign Braverman's sign Crowe sign Dennie–Morgan fold Darier's sign Fitzpatrick's sign Florid cutaneous papillomatosis Gottron's sign Hutchinson's sign Janeway lesion Kerr's sign Koebner's phenomenon Koplik's spots Leser-Trelat sign Nikolsky's sign Pastia's sign Russell's sign Wickham striae Wolf's isotopic response Munro's microabscess
Nails	Aldrich-Mees' lines Beau's lines Muehrcke's lines Terry's nails