What is a nevus?

A nevus is a common type of skin growth that is typically benign. It is also known as a mole and is caused by a cluster of pigmented cells. Moles can vary in size, shape, and color, and most are harmless. However, some moles may develop into melanoma, a type of skin cancer, so it is important to monitor moles for any changes in size, shape, or color and to have them checked by a dermatologist regularly.