The American Academy of Allergy, Asthma and Immunology states that approximately 10 percent of people report having a penicillin allergy -- but greater than 90 percent might not be truly allergic. A true penicillin allergy is caused by antibodies that the immune system has formed against the antibiotic.

Epididymitis refers to a bacterial or sexually transmitted inflammation of the epididymis, a structure in the male reproductive tract that is responsible for carrying sperm. Some symptoms of epididymitis include a tender scrotum, pain in the testicles, painful intercourse and painful urination.

Amoxicillin is an antibiotic in the penicillin class of antibiotics that has a somewhat broader spectrum of effectiveness, meaning that it is effective against more kinds of bacteria.

Gum disease, also called periodontal disease or periodontitis, features receding gums that may be swollen, dark red and tender. It is caused by plaque and bacteria on teeth, which harden into tartar; poor oral hygiene can play a role. If you have signs of gum disease, MayoClinic.

Drugs can have interactions with other drugs, as well as certain foods and other substances. Although most of the interactions you hear about are adverse in character, sometimes the reverse can be true. Such is the case with amoxicillin, a penicillin-based antibiotic, and caffeine, a central nervous system stimulant.

Antibiotics are chemicals that have the ability to inhibit the growth of microorganisms, especially bacteria, and are either produced naturally by other microorganisms or synthetically in a laboratory.

An infection involves the colonization of tissues in the body by bacteria, viruses or fungi. During the infection process, the infectious agent enters the body, identifies cells containing specific factors that facilitate infection, and then colonizes cells or tissues, leading to disease.

Diverticulosis is the disease process that occurs in the large intestine when a diveriticulum--a small bulging sack protruding from the large intestinal wall--becomes ruptured. You may begin to feel pain in the abdomen.

According to the American Academy of Dermatology, 40 to 50 million Americans suffer from acne. It is the most common skin condition in the United States. Enduring acne is not only painful, but can take a toll on self-esteem. Many treatment options are available.

According to the Centers for Disease Control and Prevention, Klebsiella pneumoniae is a gram-negative bacterium that is commonly found in the human digestive system.

Acidophilus supplements can help you prevent the diarrhea and other digestive problems that are associated with antibiotic use, notes MedlinePlus. The intestines naturally contain some non-infectious bacteria. In addition to aiding in digestion, these bacteria help crowd out other, more harmful bacteria.

Acne is a common skin condition that, according to WrongDiagnosis.com, affects almost 85 percent of people in the United States between the ages of 12 to 24. It is an inflammatory disease that is characterized by the appearance of varied lesions and blemishes on the skin.