I would expect it's the fold at the front of her armpit. The way she's holding that arm the fold could very well extend part way round it. Essentially it's caused by the interaction of the deltoid and bicep muscles. I think that a similar line is visible in your photo for triple-a to the right. What this looks like to me is a case of wanting to look like you're doing your job. An editor who looked at the original photo and said "Okay, just clean this bit." would be afraid people thought he wasn't paying enough attention to this task, so to prove that he is doing his job he overdoes it.

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