Piercing of minors is allowed following the Fl Department of health rules, which requires a signed and notarized parental consent form linked below.

From the state rules here

Piercing of a Minor

Minors. – A person may not perform body piercing on a minor without the written notarized consent (17.3 KB) of the minor’s parent or legal guardian, and an establishment may not perform body piercing on a minor under the age of 16 unless the minor is accompanied by a parent or legal guardian as specified in section 381.0075, Florida Statutes.

This act constitutes a misdemeanor of the second degree, punishable as provided in s. 775.082 or s. 775.083, Florida Statutes.

Complaints concerning the piercing of a minor should be reported to the local law enforcement agency as well as the local Department office having jurisdiction of the body piercing program.