And you received good advice.I was told that Vaseline and Bag Balm make it worse and you should just leave it.
Any product put on the comb and wattles with a freezing point that is higher than the expected lows will cause frostbite, not prevent it.
And once frostbite has set in, it should be monitored in minor cases. The only time you intervene is if infection is setting in.
It is always best to prevent it. Frostbite is caused by the build up of moisture in the coop that cannot escape (hence the need for excellent ventilation to remove the moisture) or when the wattles get dipped in water and it freezes on them.