So sorry that you have to deal with this and I'm sorry but I don't have any answers.
Are they any drugs that you are on that could be causing it as a side affect?
On the FamilyDoctor.Org site there is a chart regarding skin rashes(asks a question-yes/no answer and you work through until it suggests a possible name/cause of it.
Bactroban is generally used for infections and if the condition is not clearing then maybe a second opinion/skin scrape?
May all be worth a look