It might be, but only a doctor can look at it and know for sure.
It is a bit odd that you'd only have one, but it's possible. Ask your doctor to biopsy it, and don't do anything to it. Stop squeezing it, treating it with any cream, and just leave it as is so your doctor can see it and test it without anything affecting it.
If it is HPV, it's not a huge deal. It's estimated that 90% of sexually active people will get HPV at least once in their lifetimes. Some experts consider it an inevitability if you're sexually active today.
Most people will have the virus clear their body within 2 years.
Just go get it checked, don't panic, don't mess with it, and let us know what happens.