1 The lymph nodes in the groin (femoral or inguinal lymph nodes) may swell from an injury or infection in the foot, leg, groin, or genitals. 2  In rare cases, testicular cancer, lymphoma, or melanoma may cause a lump in this area. Glands can also swell following an injury, such as a cut or bite, near the gland or when a tumor or infection occurs in the mouth, head, or neck. 2  Glands in the armpit (axillary lymph nodes) may swell from an injury or infection to the arm or hand. 3  A rare cause of axillary swelling may be breast cancer or lymphoma.
Gastroenteritis, also known as infectious diarrhea, is inflammation of the gastrointestinal tract that involves the stomach and small intestine. Signs and symptoms include some combination of diarrhea, vomiting, and abdominal pain. Fever, lack of energy, and dehydration may also occur. This typically lasts less than two weeks.
Diarrhea â loose, watery stools occurring more than three times in one day â is a common problem. There are many causes of diarrhea. Temporary diarrhea lasting three weeks or less could be a symptom of a foodborne illness and is usually related to bacterial, viral, or parasitic infection. Temporary diarrhea may also be caused by food intolerances, food allergies, or reactions to medicines.