Meatal stenosis is when the urethral opening at the end of the penis becomes narrow.
This condition is usually acquired but can exist from birth.
Meatal stenosis is sometimes linked with circumcision(surgical removal of the foreskin over the tip of the penis) as the newly exposed tip of the penis (including the meatus) suffers from a mild injury causing the meatus to narrow (stenosis).
Also, Uric acid and ammonia crystals if found in urine and left in diaper can cause meatel stenosis since tip of the penis usually rubs against the diaper if child is circumscribed or with child’s own skin before circumcision. These crystals may cause a low-grade inflammation contributing meatus to narrow over time.
Meatal stenosis can also occur after hypospadias repair. The new scars make the meatus narrower and cause worse symptoms.