Healing point are just warnings, and can be fixed as described in aguirRe's document: 
 
 http://user.tninet.se/%7Exir870k/tooltips.txt 
 
 AFAIK, even if you are not able to solve it, it should not prevent you to fullvis your map. 
 As example, in SRC, I had around 10 of them (for a ladder, using clipping brushes based on 0.1 grid size), and I was able to build the map without hving any leaks, HOMs, etc...
 
 Nevertheless, I agree it is better to have a warning-clean map... ;)