If the warts are visible, doctors may be able to diagnose genital warts by just looking at the symptoms. In some cases, though, diagnosing genital warts may be more difficult than it seems. This is because the warts aren't always visible, especially if they form inside on the cervix or inside the anus. In those cases, doctors may use colposcopy to diagnose genital warts. This involves putting a chemical stain in the area to make warts more visible, and then using a tiny magnifying tool to inspect the area for growths. Because women may have genital warts on their cervix without realizing it, it's important for women to get regular Pap tests to look for abnormalities that may be caused by genital warts.