Urticaria pigmentosa

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Urticaria pigmentosa is a harmless condition that produces red-brown spots or bumps on the skin. Learn how it is caused, diagnosed and treated.

Key points

  • Urticaria pigmentosa is the most common type of childhood cutaneous mastocytosis.
  • Most UP appears before the age of two and often disappears or improves greatly by puberty.
  • In most children, symptoms are limited to redness, swelling and itchiness, but diarrhea, vomiting, flushing, wheezing and anaphylaxis can also occur.
  • There is no cure for UP. Treatment is aimed at relieving symptoms by using medications and avoiding triggers.
  • See a doctor for UP if your child shows signs of a severe allergic reaction. See a dermatologist if your child develops many new spots or has UP along with vomiting and diarrhea.
Last updated: June 24th 2016