'mosquito bites' and swollen arms

[Helen C]

Hello all,

I recently started training for my first triathlon. I have noticed that on my early morning cycle training sessions I have been getting what look like mosquito bites, particularly around my elbows, and my whole arms & hands get itchy and swollen. It goes away a couple of hours after exercise. Any ideas what this could be?

[thewump]

Those symptoms sound like hives to me.

[Dianyla]

Might be cholinergic urticaria. Basically, a mild allergic response to... exercise!