Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency care for:
These are not typical features of stable symmastia.
They may indicate an acute surgical or medical problem.
Contact your surgical team promptly if a recent operation is followed by increasing redness, warmth, drainage, fever, worsening pain, or one breast becoming much more swollen than the other.
These signs may suggest infection, bleeding, or a fluid collection and should not wait for a routine follow-up.
Arrange a routine appointment if you notice a persistent bridge between the breasts, loss of cleavage after implant surgery, gradual implant movement, or discomfort over the breastbone.
A non-urgent review is also appropriate if the appearance is affecting your quality of life or you want to understand corrective options.
The article also says
A new breast lump, nipple bleeding, skin ulcer, or unexplained change in breast shape also deserves medical assessment.
These findings have several possible causes and should not automatically be blamed on symmastia or an implant.
Every sign above is quoted from the sofidex article on Symmastia. If you are not sure, err upward — it is always reasonable to be checked.