Why is my rash hot to touch?

Allergic to Touch - The Atlantic

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Plagued by a summer rash? How to tell if it's heat rash or something more sinister

Heat Rash vs. Eczema: What's the Difference?

Does anybody know what these are? They hurt when touched and I didn't even realise I had them until earlier today. Is this serious? : r/bigboobproblems

Hives vs. rash: Pictures, differences, and symptoms

Rash and Skin That Feels Hot to the Touch: Causes and Photos

Contact Dermatitis Causes, Symptoms, Natural Treatments - Dr. Axe

Skin Rash: 9 Questions That Will Help You Decode That Skin Rash