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1. Is it uncommon for a guy not to clear the virus after so many years?
2. My dermatologist told me that freezing a wart kills the cell but usually not the virus and the virus then can attach to a neighboring cell. It this common for a wart to just sort of float around the area of the original wart?
Those two questions are related. Warts usually don't recur over nearly two decades, but it's not implausible. It's correct that treatment is designed (and only truly capable) of removing the wart lesions, not the underlying virus that causes the warts. There is no medical cure for viral infections like HPV. So, the virus can hang out at deeper cell layers, probably in low numbers and not doing much of anything. If the immune system is taxed down the road, then you might have the trigger for it to emerge again.
This commentary isn't made with your specific situation in mind, but some experts say that the recurrence of warts (or any other HPV-related condition) way down the road muddies the waters as to whether it's an old infection flaring up, or perhaps a similar but different HPV type from another partner. Also, partners that share an HPV type might expose each other to it again, thus delaying clearance.
Aldara is an interesting choice with a unique method of removing warts. It actually is thought to stimulate (some would say provoke) a response from the immune system right in the cells where HPV camps out. Beyond treating the warts directly, this seems to deliver the additional benefit of reducing the rate of recurrences. Doesn't work the same in every case, but that's a good quick overview.
Best again,
Fredo