There are no contraindications to using these two products at the same time. Accutane treats the skin while Botox reaches the muscle. Please consult a board-certified dermatologist to find out how to manage wrinkles and acne simultaneously.
There are several possible reasons for this:
1) Swelling from injection fluid/volume: I don't believe this is your problem because it should be resolved by two weeks after your injection.
2) Lymphedema: This is a more likely possibility. When your muscles move, they pump fluid out of the area....
I have never heard of Botox being used for "chest lines?" I have also heard of some doctors promoting breast lifts with Botox too, but that doesn't work either, but it makes for good press!