I opened phpMyAdmin and discovered four new databases that I didn't create (I am the only user on this shared hosting plan): forumdata, freewareforum, rmoforum and veforum. When I try to drop them, MySQL returns:

Error
SQL-query:
DROP DATABASE forumdata
MySQL said: Access denied for user: 'myname@localhost' to database 'forumdata'

The databases contain no tables. What are those alien monsters, and how to kill them? I am new to PHP, so any feedback will be appreciated. Thanks!