Can melanoma appear as a 1 inch irregular diameter blue/grey bruise? on the upper outside arm?

Melanoma/bruise: Melanoma can appear anywhere. The color is usually dark brown/black and irregular. Melanomas can be flat or a bump but don't usually have a bruise unless there has been trauma to the area on top of it. A bruise is caused by bleeding under the skin. A bruise can become dark, but eventually becomes lighter, green and then yellow. It will go away. If the lesion bleeds or gets larger, see a doc