Food Allergy or Heat Rash?

I think Aiden might be allergic to avocado. He ended up with a little red pinprick rash on his arms and legs. I also think it could have been a heat rash though so I'll ask Dr. Ally what she thinks when we see her today.

Right now Aiden is playing in his exersaucer. He LOVES that thing. His favorite toys are the animal noise buttons and the slot machine. The saucer has a little book on it with a picture of an animal on each page. Aiden is always frustrated with the book though; he starts screaming and crying every time he tries playing with it.