How likely is it for someone to have urticaria pigmentosa and cold urticaria? and should i be more worried about symptoms with my son having both?

Urticaria pigmentosa: Urticaria pigmentosa is arare genetic mutation of mastocytosis of the skin. Symptoms can be mild (flushing and hives that require no treatment), moderate (diarrhea, tachycardia, nausea/vomiting, headache, and fainting), or life-threatening (vascular collapse requiring emergency treatment and hospitalization). Usually cold urticaria is annoying but not serious though in rare case it can be. The coi.