良性赘生物可以是多发的。图示子宫平滑肌瘤，大小不同，界限清楚、质硬、色白、都表现为良性。最多见良性瘤是一种良性皮肤痣（色素痣），大多数人都有几个，这种赘生物一般不会恶化。
Benign neoplasms can be multiple, as is shown in this uterus with leiomyomas of varying size, but all benign and well-circumscribed firm white masses. Remember that the most common neoplasm is a benign nevus (pigmented mole) of the skin, and most people have several. As a general rule, benign neoplasms do not give rise to malignant neoplasms.