Hello,if you meant the cancer kind of protruded outward,then that is what I had,due to the size of the tumor(12 cm),that's actually how I discovered it.When I had the mastectomy,they basically removed most of the skin as well,so there's just enough skin left to cover the ribs underneath(they are very visible).It was staged 3c.I've been cancerfree for over 10 years now,and I am sure grateful they took this rather radical approach.I recall that the tumor had not been attached to the chest muscle,as that would definitely have meant skin involvement.
I am not sure if this of any help;I wish you the best of luck in your recovery!