Congenital giant pigmented nevus; Giant hairy nevus
A bathing trunk nevus is a dark colored, often hairy patch of skin that is present at birth.
Bathing trunk nevi are thought to be caused by defects or problems that occur as a baby grows in the womb. However, in some families bathing trunk nevus may be inherited.
Bathing trunk nevus may occur with:
The risk of this condition is thought to be 3 - 7%.