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Urticaria pigmentosa


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Dermatographism - close-up
Dermatographism - close-up
Dermatographism on the arm
Dermatographism on the arm
Urticaria pigmentosa in the armpit
Urticaria pigmentosa in the armpit
Mastocytosis, diffuse cutaneous
Mastocytosis, diffuse cutaneous
Urticaria pigmentosa on the chest
Urticaria pigmentosa on the chest
Urticaria pigmentosa - close-up
Urticaria pigmentosa - close-up
Dermatographism on the back
Dermatographism on the back
OverviewSymptomsTreatmentPrevention

Urticaria pigmentosa

Alternative Names:

Mastocytosis; Mastocytoma
Symptoms:
  • Appearance of brownish lesions on skin
  • Welt or hive formation when lesions are rubbed or scratched
  • Blister formation over lesion when it is rubbed
  • Facial flushing
Severe form:
  • Diarrhea
  • Fast heart rate
  • Headache
  • Fainting (syncope)

Signs and tests:
  • Urine histamine -- shows elevated levels of histamine
  • Skin biopsy -- confirms the presence of increased number of mast cells
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