Final answer:
Skin cancer forms through genetic mutation caused by excessive UV radiation exposure. The level of pain associated with skin cancer can vary depending on the stage and location of the cancer.
Step-by-step explanation:
Skin cancer is a disease in which skin cells grow out of control. The most common form of skin cancer is caused by excessive exposure to UV light, which damages DNA in skin cells. This damage can cause the cells to grow out of control and form tumors. Therefore, the forming process of skin cancer is through genetic mutation due to UV radiation exposure.
As for the pain associated with skin cancer, it can vary. Generally, skin cancer is usually painless in its early stages. However, as the cancer progresses and affects deeper layers of the skin or surrounding tissues, it can become painful. Therefore, the level of pain associated with skin cancer can vary depending on the stage and location of the cancer.