Okay so I had a rough patch around my mouth and I put on Vaseline now it blew up looks like a cluster of mini pimples with pus and it itches?

Skin patch . It is time to show to your doctor before it spreads, it could be impetigo or herpes skin infection. Good luck .
Probable allergy. What you describe sounds a lot like an allergic reaction to the vaseline preparation you used. Try to remove all traces of it and let the skin settle. If after a few days you are still not well, see a dermatologist for help. You might have a viral skin condition or bacterial infection.