Do not do this. This will make it worse.
It's hard to say without seeing it in person. A banged in edge can kill a board. It can crack the sidewall or cause base/topsheet delams.
Go to a reputable shop and get it looked at.
Utter garbage. Ptex does not seal properly, you need something like epoxy.
Sorry guys, its a snowboard, not a mercedes benz. Scraping off the bubble is fine and will help reduce abnormal wear though it will show at the end of the board's life. The other dent is not large enough for epoxy, is not large enough to worry about and therefore ptex will be fine on it for now. It will in no imaginable way make things worse.
This is a very, very minor ding and not worth getting this worked up about. Small ding, easy fix, keep riding.