It was becoming an increasing issue until I shaved my head. While that hasn't cured it (only been a week now) it does seem that no new ones are appearing and those that were already there are starting to heal.
Are you exfoliating your scalp at all?
Also if you've been on antibiotics for it for 2 months and that is not helping then it may actually be fungal in nature, in which case the antibiotics won't do anything for it.