My son has an insect bite and he's on the way to the doctor's...?!

My son has an insect bite and he's on the way to the doctor's...?

My son is camping with my Grandmother about 4 hours away from where I am. Last night, something bit him on his arm and it's since then swelled up to about a 3 inch radius. This morning, he felt nauseus and my Granmother just called telling me he's feverish and feeling really ill, so she's packing up and bringing him back to her house, which is another three hours from where I am. She plan on bringing him to the doctor or the emergency room as soon as she gets there, depending on if he's the same or worse. My question is, does anyone know what could have bit him for him to have this reaction? They were camping at a campground, digging in the sand and swimming in the ocean in lower Connecticut.

From the sounds of his symptoms it seems like he got bit by a spider. He really should see medical personnel before they begin travelling just incase he starts to get worse. Some of the symptoms seem like it's a black widow spider bite, but I don't think that's possible in Connecticuit. They really shouldn't waste time travelling back to her house, she should take him to the closest first-aid station or emergency room for treatment. Good Luck!