Is it common to have a crease under breast after mastectomy and how is this corrected? (Photo)

January was not that long ago.  Your skin still looks swollen.  The skin will soften and shift with time.  I think the crease will go away.  Fat grafting can help if it does not go away.

Either your skin "folded" on itself during the expansion process or that is your native crease and the expander has created a new one.  Either way, it can be corrected at the second stage by an experienced surgeon.  Talk to your PS about this and discuss the options.

This can certainly happen from many different things. It could be the implant or it could just be the skin folded on itself from the hanging skin after mastectomy. Usually as the tissue is expanded with a tissue expander it will push that crease out. It can also be addressed at a later procedure during the reconstructive process. It could also be the old breast fold that is being pushed up as you are expanding. Again, it may be able to be corrected at your secondary procedures.

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I am not sure why you have a crease without seeing you , but it can occur with expanders and alloderm placement.