Please help with 1yr old, keeps biting until it bled.

Please help with my 1yr old Jindo, he has been biting his buttocks at the base of the tail lately.
He actually bit and pulled a big chunk of hair out, literally bald. I was wondering if anyone else have
noticed this type of behavior on their dog? if so, please help with any solution.
It was a real struggle for me to clean up his wound and patch it up so it wouldnt get infected, but
he continues to bite it whenever I take my eyes off him. The last time I caught him biting himself on the spot
it was bleeding.

Thank you for your time and solution,
Veronica

Take him to the vet asap. Allergies will cause this, as will hot spots and
other issues. He may just need some allergy medication but you'll have to
find out for sure.

--
Tara