After movement and tissue around the nipple complex there can be several skin changes. You have swelling and some changes consistent with bruising.Follow up with you provider and look for solutions to reduce the swelling.
Plastic surgeons may utilize a post surgical bra for compression (especially if drains are not used), support (to prevent premature drop or droop) or to achieve other cosmetic goals, as well as for patient comfort. (Many times a nonbouncy breast is less painful). Discuss this with your surgical...
I have seen hidradenitis of the nipple and breast but other sources of chronic nipple infections exist. Removal of the offending duct/s may be all that is necessary to prevent the problem. If the hidradenitis actually involves the nipple areolar complex, surgery may need to be more extensive but...