Usually, a rash or a low-grade fever of 100.5 degrees F. is nothing to worry about. Having the two symptoms at the same time, though, could be a sign of a potentially serious illness--and means you should head to the ER ASAP, according to the American College of Osteopathic Emergency Physicians.
That's because there are several deadly diseases that produce this combination of symptoms. One is toxic shock syndrome (TSS), which many people just associate with tampon use. But TSS is a bacterial infection, and you can get it if a cut or a burn gets infected or if you've just had surgery, no matter how minor.
Another potentially dangerous disease: Rocky Mountain Spotted Fever, caused by tick bites. Ticks are as plentiful in the fall as they are in the summer, so if you've been outdoors recently (even in your backyard) and you live in the west or southeastern United States, be aware. Left untreated, this tick-borne disease can really do damage to your kidneys, brain, and lungs, and can even be fatal.
The bottom line, says this doctor's group: If you've got a rash and a fever over 100.5 degrees, don't brush it off. Getting it checked out by a medical pro could save your life.
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