A fever is your body's way of dealing with an "intruder", (bacteria or virus). The body heats up in an attempt to kill the invader. A fever of 100, depending on how you measured it, is probably nothing to worry too much about. When you have a fever that remains 102+ despite taking ibuprofen or acetaminophen as directed, then you might start to think about calling your MD. Cool showers, or cloths can help, as well as light clothing and light blankets or just a sheet while sleeping. If this lasts for more than a few days, and does not respond to medication ( tylenol / advil etc) then perhaps you might need an antibiotic to help your body fight it off. Hope this helped.