These are the warts appearing on the oral cavity or the lips. These growths are harmless in nature unless otherwise irritated. It can be single or in a group, and looks like a small round growth or a larger flat-looking growth or thick leafy-looking patches of skin. Human Papilloma Virus is the cause behind these warts. This virus invades the broken skin and develops. The first noticed symptom of this may be discomfort in eating or swallowing. Patient may experience minor bleeding if one of these is damaged. These warts have the tendency to disappear over time, if left unharmed.