There are many different types of HPV, commonly known as genital warts.
The biggest risk is cervical cancer, which comes from high risk HPV. What your sister apparently had was one of the types that causes genital warts. These are low risk, and don't tend to lead to a risk of cervical cancer. It's not a big deal, but she does need to make sure she's gotten a free and clear from her gyno before she has sex again so that she doesn't pass it on to a new partner.
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