Big red spots that sting and itch , also spread quickly. what. are they. ?

Hives without bees: Unless you know what you are allergic to, it is often very difficult to find the specific cause your rash--likely hives. This can be quite itchy and may have burning sensation to it. They often come rather quickly, spread, and often subside in few hours; but could last for days. Benadryl/zyrtec/claritin and/or calamide lotion may help. If worsens, consult doc. Good luck.