hi Karin,
the eruption described above or eruptions like impetigo,or bullosa will cure with in a week to ten days.In my web(
www.pannakkal.com) under section 'skin 'you can see a picture of a child with impetigo bullosa(before and after treatment).it took only 10 days with a single dose of Hep Sulph 200.
if you are repeating again and again more and more new eruptions will appear ,by proving or disease aggravation.The best method is one dose and wait.It will not complicate the case.
Repetition depends upon case.
with regards,
pannakkal