If by blisters you mean actual fluid-filled bubbles, then this may indeed be herpes. A culture at the time the blisters reappear would be definitive. Otherwise, a herpes 2 IgG test can be very decisive either way--a negative test means you don't have it, a positive one means you do. For reliable tests, see www.herpesdiagnosis.com.
I don't know what it means to "battle molluscum" for 6 years, as I have never seen this happen. I am skeptical that this diagnosis continues to be correct, even if it once was. I advise another dermatologic opinion.
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