What form of skin cancer causes blue spots under the skin?

Blue spots under the skin can be a sign of several skin conditions, including:

- Bruising

- Vasculitis

- Malignant melanoma

Malignant melanoma is the most serious type of skin cancer. It can start as a small, irregularly shaped brown or black spot on the skin. Over time, the spot can grow larger and become darker. It can also develop into a lump or nodule.

Bruising occurs when small blood vessels in the skin are damaged. This can happen due to trauma, such as a fall or a blow to the skin. Bruises usually appear as blue or purple spots on the skin.

Vasculitis is a condition that causes inflammation of the blood vessels. This can lead to a variety of symptoms, including blue spots on the skin. Vasculitis can be caused by a variety of factors, including infection, autoimmune disorders, and certain medications.

If you notice any blue spots on your skin that are not related to trauma or an obvious cause, it is important to see a doctor to determine the cause and receive appropriate treatment.