I would strongly suggest that you stay off suppression entirely and with the next lesion, get it swab tested right away when it shows up. False positive cultures are rare indeed but so are false negatives on the western blot. We could expect a negative western blot due to your continued antiviral medicine use, however. If you are taking suppression when they get a lesion, you likely to get a false negative swab test. If you are off suppression for 3 months, that should give you plenty of time to develop antibody detectable by IgG and/or western blot and also, if you have an outbreak, you can get a more accurate swab done during that time.