Most nevi are pigmented, but some are not. The brown color in the nevus is melanin . Other types of moles may be very large, or have irregular borders. There are dozens of different types of nevi, of many shapes, colors and sizes. While most nevi are benign, malignant changes can occur to turn the benign nevus into a melanoma.
Risk Factor a personal attribute that correlates with an increased risk for developing skin cancer.
If melanoma cells are found in the sentinel node, wide dissection of nodes is carried out as a therapeutic measure. It is currently debatable whether removing cancerous lymph nodes prolongs survival. This cancer can metastasize and cause death. The staging system for melanoma has changed repeatedly over the years and continues to evolve. The intricacies and changing nature of melanoma staging can be quite confusing.