Is Hemophilia only genetic?

I'm writing a book and I'm in the process of thinking of a sequel for it. My only obstacle is I was planning on making the main character a hemophiliac.
My question now is whether Hemophilia is an inheritence-only kind of disease or if someone can develop it over time. Because if it is an inheritence-only disease, that kind of screws me over on the sequel.
And I'm not sure this topic belongs here, but I wasn't sure where else to put it. Thanks for any help you can give me.

[Jordanna Joaquina, MS, CGC]

The major types of this condition are hemophilia A (also known as classic hemophilia) and hemophilia B (also known as Christmas disease). Although the two types have very similar signs and symptoms, they are caused by mutations in different genes.

People with an unusual form of hemophilia B, known as hemophilia B Leyden, experience episodes of excessive bleeding in childhood, but have few bleeding problems after puberty.

Another form of the disorder, acquired hemophilia, is not caused by inherited gene mutations. This rare condition is characterized by abnormal bleeding into the skin, muscles, or other soft tissues, usually beginning in adulthood.