Ears neck and back are burning and red. Feels like sun burn. I got it randomly at 10:45PM. Started with burning in the ears?

Possible allergy. Erythema is redness of the skin; Urticaria is itching of the skin, often associated with erythema. In the absence of sun exposure, drugs and foods can cause each of these two. Since an allergic reaction could be serious, it would be advisable to see ones doctor (or go to an emergency department) immediately.