Can you tell me how to tell if i have bug bites or an allergic rxn?

One in same, really: Bug bites are allergic reactions to the saliva of the insect; sometimes the anticoagulants that keep the blood flowing till they've had their fill. Local release of histamine and other chemicals trigger the swelling and itching. One tip is that bug bites are isolated bumps, often appearing in clusters ("breakfast, lunch and dinner"). Often there's a tiny blister right in the center of the bite