They put Vaseline on fighters mainly to protect their skin and keep them in the fight longer by reducing cuts, swelling, and friction.

Main reasons they use Vaseline

  • Reduces friction: A thin layer of Vaseline makes the skin slippery, so when a punch lands, the glove tends to slide off instead of “grabbing” the skin and tearing it.
  • Prevents and limits cuts: Less friction means fewer new cuts, and existing small cuts are less likely to split wide open, which can force a doctor or referee to stop the fight.
  • Minimizes swelling and damage: Vaseline forms a light protective barrier that helps the skin stay soft and slightly cushioned, which can reduce swelling and visible damage from repeated strikes.
  • Helps manage existing cuts: Between rounds, the cutman may work on a cut and then seal it with Vaseline so it bleeds less and doesn’t worsen as easily when it’s hit again.

How and where it’s applied

  • Cornermen or licensed cutmen usually apply a very thin layer to high‑risk areas like eyebrows, cheekbones, and around the eyes before the fight and between rounds.
  • They carefully avoid the eyes and use only as much as rules allow; too much can be considered an unfair advantage or even lead to warnings or disqualification if it affects grappling and submissions.

Safety and rules

  • Athletic commissions in boxing and MMA regulate how much and where Vaseline can be used, treating it as a safety aid rather than a performance enhancer.
  • The goal is fighter safety : fewer deep cuts, clearer vision, and less chance of a fight ending early purely because the skin split open badly.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.