I got a hard bump on the roof of my mouth and then it was soft and slightly painfull pus came out of it and it healed now its back same place. herpes?

Mouth pustule: The fact that your roof of mouth hard bump softened and drained pus argues strongly for a pustule (bacterial infection) rather than an herpetic sore. But then again the fact that you now have the bump back again in the same area makes recurrent herpetic sores a possibility. You should see your internist so that the sore can be visualized and treated.