This is a very commonly asked question, says Dr. Anu Kapoor, a leading skin specialist in Delhi. Too much sun exposure can mutate the cells. As the free radicles cause mutation in the cells, it can lead to malignant melanoma (skin cancer). This cancer begins to occur in form of moles. So, if some spots are present on the skin and they spread and get darker with time, it is advised to seek expert help to detect if the spot is cancerous or not. Our dermatologists can guide you about the same after proper investigations when you visit the clinic for skin pigmentation treatment in Delhi. It is advised to protect the skin from sun damage to avoid the risk of skin cancer.