Difference between revisions of "General approach to rashes"

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{{Generalized rash DDX}}
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{{General rashes images}}
{{General rashes images}}
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==See Also==
==See Also==

Revision as of 10:40, 10 June 2015


Dermatology Nomenclature

Small lesions (<0.5cm)

Name Raised/Palpable Fluid-Filled Other Description Diagram
Macule No None flat, cirumscribed, colored Macule.png
Papule Yes None Solid Papule.png
Vesicle Yes Clear Vesicles (2).png
Pustule Yes Pus Leukocytes or keratin Pustules.png

Large lesions (>0.5cm)

Name Raised/Palpable Fluid-Filled Other Description Diagram
Patch No None Large macule (flat, colored) Patch.png
Plaque Yes None Superficially raised, circumscribed solid area Plaque.png
Nodule Yes None Distinct large papule Nodules.png.png
Bulla Yes Clear Large vesicle/blister or exposed epidermal layer Bulla.png
Wheal Yes Edema Firm and edema of dermis


Ulcer, fissue, and erosion
  • Plaque/scaley papule
  • Eschar
  • Fissure/erosion/ulcer
  • Purpura/petechia
  • Plaque/smooth papule

Differential Diagnosis


Rash visual diagnosis



  • Vitiligo
  • Pityriasis alba
  • Tinea versicolor
  • Postinflammatory hypopigmentation
  • Piebaldism
  • Tuberous sclerosis
  • Hypomelanosis of Ito

See Also