Localized heat contact urticaria
Encyclopedia
Localized heat contact urticaria is a cutaneous condition, one of the rarest forms of urticaria
Urticaria
Urticaria is a kind of skin rash notable for pale red, raised, itchy bumps. Hives is frequently caused by allergic reactions; however, there are many non-allergic causes...

, where within minutes of contact with heat from any source, itching and whealing occur at the precise site of contact, lasting up to 1 hour.
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