Possibly have you previously had a cold virus? Peradventure did you get rid of the issue? Naturally you recovered! You will not heal a runny nose itself, but your immune system usually develops resistance to a certain cold infection within several days. We call that cured by your personal immune response!

HPV is the same because HPV is just another virus. And you could normally develop immunity to human papilloma virus. However, HPV is more adept at hiding from your body's immune system compared to the common cold viruses. So you must try harder to get immunity to HPV.
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