Fever of 100.9 from last week went down, but after 4 days it's back up to 99.1? should i be worried? i thought i wasn't sick anymore... took tylenol (acetaminophen).

Normal: Although 98.6 F was considered normal in the past, the new normal is 99 . Don't worry if you feel healthy otherwise.

Not fever.: Temperature of 100.9 is a low to moderate fever but 99.1 is not a fever. Do you have any other symptoms besides fever like cough, cold, vomiting, diarrhea etc.? If not why do you have a need to take daily temperatures? Please stop taking temperature everyday if you are not feeling sick anymore.