Large blueish stain beneath skin essential collar bone?

What might be a large, faint blueish stain-like appearance under the skin between my d¨¦colletage and chest (left side, about 5" long)? Been there for several months, came on suddenly, does not hurt. Thank you.
Answers:    Maybe it is varicose vein...

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is it changing in size, are there any other ones over the body?

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