Contact dermatitis is a skin reaction from contact with certain substances. Read on to learn about its causes, symptoms, and treatment.

Detailed information on heart defects that cause too little blood flow through the lungs

Atopic dermatitis is a long-term (chronic) skin condition. It causes dry, itchy skin. It’s very common in babies and children. It often first appears between ages 3 and 6 months.

Tetralogy of Fallot is 4 congenital heart defects. This means that your child is born with them. These 4 problems occur together (tetralogy refers to 4).

Echocardiography is an imaging test. It uses sound waves to make detailed moving pictures of the heart. It shows the size and shape of the heart, as well as the heart chambers and valves. Transesophageal echocardiography (TEE) uses a device, called a transducer, that is placed in the esophagus.

Asthma triggers are things that can cause an asthma flare-up. Your health care provider can help you know what your triggers are and how to manage them.

Detailed information on asthma, including triggers of an asthma attack, symptoms, diagnosis, management, and treatment

Anaphylaxis is a severe and sometimes life-threatening reaction to an allergen. An allergen is something that your child is allergic to. Anaphylaxis is a medical emergency. Your child can have a reaction within seconds or as long as an hour after contact.

Detailed information on allergy, including symptoms, diagnosis, and treatment

X-linked agammaglobulinemia is a rare genetic disease that causes a weakened immune system. It mainly affects boys.