Seek immediate medical attention if you begin to have difficulty breathing or develop hives, a fever, a fast pulse, confusion or nausea. These could be signs of a life-threatening allergic reaction.
Always consult your doctor promptly if a rash:
Lasts longer than one week
Shows signs of local infection (oozing, redness or swelling of the skin)
Occurs together with fever, chills, swollen glands or other symptoms of infection (sore throat, cough, headache, nasal congestion, etc.)
Occurs together with symptoms that suggest an autoimmune disorder, such as recurring fever, malaise, fatigue, unexplained weight loss or joint swelling