Thank you for the question and pictures. It is very difficult, based on the photographs, to tell whether you are dealing with a breast implant displacement problem. To me, not knowing more of your history, it seems like the lower pole of the breast ( where you see redness) seems to be irritated ( possibly by a bra?).
“Double bubble” issues are not necessarily painful. Sometimes however breast implant displacement problems that cause the appearance of the double bubble may be painful; this discomfort is often alleviated when the patient supports the area involved.
Best, for accurate diagnosis, advice, and/or reassurance, to be seen by your plastic surgeon.
Best wishes.