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In childhood, the risk of anaphylactic episodes has been shown to be limited to those with extensive blistering skin disease, but nonexistent for children with mastocytoma or limited disease.
In adults, anaphylactic episodes generally appear to be more severe in patients with extensive systemic disease.
Dirk M Elston, MD Professor and Chairman, Department of Dermatology and Dermatologic Surgery, Medical University of South Carolina College of Medicine Dirk M Elston, MD is a member of the following medical societies: American Academy of Dermatology Disclosure: Nothing to disclose.
When a urticaria pigmentosa or mastocytoma lesion is stroked, it typically urticates, becoming pruritic, edematous, and erythematous.
This change is referred to as the Darier sign, which is explainable on the basis of mast cell degranulation induced by physical stimulation.
Uncontrolled stroking of mastocytomas should be avoided in patients who have had a systemic reaction such as miosis and asthmalike symptoms in their past.
The Darier sign usually is not positive in patients with TMEP because the lesions are paucicellular, and, therefore, mast cells may not be present in sufficient numbers for significant degranulation to occur. Increased local concentrations of soluble mast cell growth factor in lesions of cutaneous mastocytosis are believed to stimulate mast cell proliferation, melanocyte proliferation, and melanin pigment production.
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Associated systemic manifestations are believed to reflect the release of mast cell–derived mediators, such as histamine, prostaglandins, heparin, neutral proteases, and acid hydrolases.