top rot or top rot not

So what started out lookin like a case of root rot I think may have turned into top rot. Noticed sum white fuzzy stuff on one of the top colas, right around where fan leaves used to be before they fell off ( I think). Cut that litlle bit off, but then again I found a little bit on each cola (she was topped), and cut off any nugs that had it on them. My question is, am I fucked and I have to take off the whole top cola or the white fuzz will re-appear, or should it be left alone now and the fuzz wont reappear???help????? also will H2O2 watering help this at all??