What Causes a Strep Pharyngitis Rash?

A strep pharyngitis rash can occur as a complication of strep throat pharyngitis, also known as strep throat infection. The strep pharyngitis rash doesn't affect all people who get strep throat infections. Experts believe that the skin rash occurs only in those who are allergic to the toxins that streptococcus bacteria release.

Strep throat pharyngitis, an inflammation of the pharnyx and tonsils usually caused by a strain of streptococcus bacteria, is believed to be most common in persons aged five to 15. Strep throat can lead to serious complications, including rheumatic fever and scarlet fever, if not treated promptly.

Symptoms of strep throat infection can include a sudden fever. The fever associated with active strep throat infection usually reaches its highest temperature on the second day of the infection. The throat may feel sore, and become inflamed, and white spots may appear in the back of the throat. Nausea, chills, upset stomach, and headache often accompany this infection, along with general feelings of illness. Lowered appetite, inability to taste foods as normal, swelling of lymph glands in the throat, and trouble swallowing also usually accompany a strep throat infection.

There are several strains of streptococcus bacteria that can cause strep throat infections in humans. Not all of these strains are capable of causing the skin rash known as strep pharyngitis rash. Strains that can cause strep pharyngitis rash may vary from one person to the next, since the rash is believed to be the result of an allergic reaction to the toxins that streptococcus bacteria can release as part of their normal life cycle.

Strep throat infections can be diagnosed by culturing a swab from the back of the throat. Quick tests, which take about 10 to 20 minutes to give results, are generally used by health care providers to make a quick diagnosis. A quick diagnosis is generally recommended in children, who are considered to run the highest risk of dangerous complications. These quick tests aren't always accurate, however, and a second swab may be sent to a laboratory for a more thorough, accurate examination. Results of laboratory tests are normally returned within 24 to 48 hours.

Strep throat infections, and the strep pharyngitis rash, can generally be easily treated with a short course of antibiotics. Penicillin may be the most popular antibiotic for treating this infection, but other antibiotics are available for those who can't take penicillin. A 10-day course of antibiotics is usually prescribed. Persons suffering from strep throat infections may be considered contagious for 24 to 48 hours after beginning a 10-day course of antibiotics.