<unk>  is the appearance of punctate bleeding spots when psoriasis scales are scraped off, named after Heinrich<unk> . Importantly, as with many eponymous clinical<unk> s, Heinrich<unk>  was not the first to discover the<unk>  named after him. It was<unk> 's mentor at the Medical University of Vienna (Ferdinand von Hebra) and Parisian dermatologist Marie Devergie who first noted the punctate hemorrhages underlying psoriasis scales. This pinpoint bleeding results from a thinning of the epidermal layer overlying the tips of the dermal papillae. Blood vessels within the papillae are dilated and tortuous, and often bleed readily when the scale is removed. Although classically associated with psoriasis, subsequent research has found<unk>  to be of very little diagnostic value for the disease. This is because several other diseases display the<unk>  (including Darier's disease and actinic keratosis). Additionally, only a minority of psoriasis scales show it when removed (<18%). This overall indicates that<unk>  is neither highly sensitive nor specific for psoriasis, and thus should only be used in combination with other findings to make a diagnosis.
Auspitz's sign
Hegar's sign
Litten's sign
Litten's sign 
Dance's sign
Cullen's sign
Destot's sign
Froment's sign