Should I keep using Vaseline if I'm having a reaction? (photos)

Bruising, swelling, and blistering can all be seen after facial surgery, well outside the bounds of the actual operated area.  Vaseline is fairly gentle substance, and I've not seen reactions to it in my practice; I agree with Dr. Bain that topical antibiotic preparations are much more likely to result in an allergic/ contact dermatitis-type reaction.  Your photos are blurry, but blistering around the mouth may suggest a cold sore outbreak; this may certainly result in itching, pain, and swelling--on top of the expected post-surgical symptoms.  I recommend you follow your surgeon's instruction and contact their office to see if an in-person evaluation is in order here.  Good luck in your recovery.

The primary reason for your soreness is probably all of the bruising and swelling you've experienced post operatively.  It's not uncommon following Mohs excisions and reconstructions on the face for patients to have significant bruising at and below the operative site due to the many blood vessels on the face.  In general, you should follow the instructions of the surgeon performing the procedure for post operative care guidance.  Vaseline (petrolatum) is relatively insert and unlikely to cause you to have a reaction.  Many over-the-counter topical antibiotics are common causes of allergic contact dermatitis (Neosporin being one of the main offenders) which is why most dermatologists and Mohs surgeons will recommend plain Vaseline to be applied to surgical sites.  But with any concerning changes at your surgical site (worsening redness, discharge, tenderness, bleeding or swelling), contact your surgeon as he or she may want to see you in person for a more thorough evaluation.