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Is it an antibody test or a PCR?
Forget about it. It is usually to detect herpes virus in the spinal fluid. The blood test is an antibody test. If IgM is increased, you have herpes. IgG can't tell you have it now or you had it in the past.
They doesn't seem to be herpes. Your doctor can culture the sample. It is accurate.
They don't cause sores.