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Radial longitudinal deficiency (radial club hand) is a rare condition that affects the forearm.

Reye syndrome is a rare condition that affects the normal chemical balance in the body, resulting in potential damage to all organs, but primarily the brain and liver.

Robin sequence (aka Pierre Robin sequence) is a combination of facial differences that are present at birth.

Rocky Mountain spotted fever (RMSF) is an infection caused by a type of bacteria carried by ticks.

Roseola is a viral illness that results in a rash or skin eruption. It usually consists of a high fever and a rash that develops as the fever decreases.

Retinopathy of prematurity (ROP) affects blood vessels in premature babies’ eyes. Infants with more severe forms of ROP face a serious risk of blindness.

Rett syndrome is a genetic disorder that causes a loss of spoken language and motor skills, as well as behavioral and neurological problems.

Rhabdomyosarcoma is a cancerous tumor that grows in the body's soft tissues.

Rheumatic fever is a systemic immune disease that affects the joints, skin, heart, blood, vessels, and brain.

Ringworm is a skin condition characterized by a ring-shaped red, scaly rash, or patches with clearing centers.