Dark spots -dime sized- under large breasts, occasionaly puss filled. age - 16?

Underneath my breasts, over the last few months, I've began to get dark spots. At first, I thought they were pimples, because I popped a large one... but now they don't seem to be puss filled, just dark and ugly. I am 16 years old, and female.. White, with pale pale skin and a bit over weight. I have them,... show more Underneath my breasts, over the last few months, I've began to get dark spots. At first, I thought they were pimples, because I popped a large one... but now they don't seem to be puss filled, just dark and ugly. I am 16 years old, and female.. White, with pale pale skin and a bit over weight. I have them, mainly, under my right breast - the latest of which is dime sized and starting to develop into a bump. It is Dark purple, almost brown.
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