These growths can be noncancerous (benign) or cancerous (malignant). Abnormal growths found in the bone can be either benign (noncancerous) or malignant (cancerous). Skin infections with HPV can cause noncancerous skin growths called warts (verrucae). Nasal polyps (NP) are noncancerous growths within the nose or sinuses. Atypical hyperplasia is a benign (noncancerous) cellular hyperplasia in which cells show some atypia. Multiple benign or noncancerous bone tumors develop in the affected individuals. Many types of skin tumors, both benign (noncancerous) and malignant (cancerous), exist. Small growths called papillomas are the most common noncancerous tumors seen with this condition. It may also determine whether tumors in the lymph node are cancerous or noncancerous. Gwynn had three procedures to remove noncancerous growths from his parotid gland beginning in 1997. Hemangiomas are benign (noncancerous) vascular tumors, and many different types occur. This uncontrolled cell division can result in the formation of noncancerous and cancerous tumors. By inhibiting ODC, eflornithine inhibits cell growth and division of both cancerous and noncancerous cells. Noncancerous skin tumors are also common. In the beginning, tumors can be noncancerous, but if they become malignant, they are cancerous.