What are the physical signs of having a fever?

Could be many. Fever (an elevated body temperature) can be accompanied by (signs of) rash, especially forehead and cheeks, headaches, chills, dehydration, feeling of malaise (fatigue), general redness of the face (if not an outright rash), sweats (as fever abates) and many more. An md could give a more detailed answer as I am but an orthodontist...I answered as it says you have been waiting a while for an answer.