Diascopy

Diascopy is a test for blanchability performed by applying pressure with a finger or glass slide and observing color changes.[1][2][3][4]

It is used to determine whether a lesion is vascular (inflammatory or congenital), nonvascular (nevus), or hemorrhagic (petechia or purpura). Hemorrhagic lesions and nonvascular lesions do not blanch ("negative diascopy"); inflammatory lesions do ("positive diascopy"). Diascopy is sometimes used to identify sarcoid skin lesions, which, when tested, turn an apple jelly color.

References

  1. ↑ Marks, James G; Miller, Jeffery (2006). Lookingbill and Marks' Principles of Dermatology (4th ed.). Elsevier Inc. Page 29. ISBN 1-4160-3185-5.
  2. ↑ Goldman, L.; Plotnick, H.; Balinkin, I. (May 9, 1957). "Investigative and clinical studies with diascopy in dermatology". Archives of Dermatology. 75 (5): 699–705. doi:10.1001/archderm.1957.01550170067012. PMID 13410135 – via PubMed.
  3. ↑ D, Pérez-López; M, Pena-Cristóbal; Em, Otero-Rey; I, Tomás; A, Blanco-Carrión (October 1, 2016). "Clinical value of diascopy and other non-invasive techniques on differential diagnosis algorithms of oral pigmentations: A systematic review". Journal of clinical and experimental dentistry. PMID 27703615.
  4. ↑ Rudd, M.; Eversole, R.; Carpenter, W. (March 9, 2001). "Diascopy: a clinical technique for the diagnosis of vascular lesions". General Dentistry. 49 (2): 206–209. PMID 12004702 – via PubMed.


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