Genital warts usually appear as a small bump or group of bumps in the genital area around the penis or the anus. These warts might be small or large, raised or flat, or shaped like a cauliflower. The warts may go away, or stay the same, or grow in size or number. Usually, a healthcare provider can diagnose genital warts simply by looking at them. Genital warts can come back, even after treatment. The types of HPV that cause warts do not cause cancer.