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Crohn's disease is when there is redness, swelling (inflammation), and sores along the digestive tract. It is part of a group of diseases known as inflammatory bowel disease.

A pregnancy that develops outside the uterus is called ectopic pregnancy. This nearly always happens in a fallopian tube. So it’s often called tubal pregnancy. Rarely, an ectopic pregnancy will happen in an ovary, in the cervix, or in the belly (abdomen).

Scleroderma is an ongoing (chronic) disease that causes abnormal growth of connective tissue. It can affect the joints, skin, and internal organs. Learn more about this condition in a child, including what it is, what causes it, what the symptoms are, and how it's diagnosed and treated.

Septic arthritis is an infection in the joint fluid (synovial fluid) and joint tissues. Read more about this condition in children.

A ventricular septal defect (VSD) is a congenital heart defect. This means that your baby is born with it. A VSD is an opening or hole in the dividing wall (septum) between the 2 lower chambers of the heart (right and left ventricles). VSDs are the most common type of congenital heart defect.

Bacteria on the skin can cause an infection of one or more hair follicles. A hair follicle is the base or root of a hair.

Lymphadenopathy means swelling of the lymph nodes or glands. It can occur in just one area of the body, such as the neck. Or it may affect lymph nodes throughout the body.

When a chromosome is abnormal, it can cause health problems in the body. Tests called studies can look at chromosomes to see what type of problem a person has.

Chromosome problems usually happen as a result of an error when cells divide.