Urticaria pigmentosa
Alternative names:
mastocytoma; mastocytosis; systemic mastocytosis
Symptoms:
- appearance of brownish lesions on skin after birth
- welt or hive formation when lesions are rubbed or scratched
- blister formation over lesion when it is rubbed (younger child)
- facial flushing
Severe form:
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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