Post op breast reduction with side breast lipo & suddenly feel a clumsiness/lumpy feeling?

Hello. I had my breast reduction 2 months ago.Within the first couple weeks I noticed a firm clumsiness mass-like area to the side of one of my incisions (around area where lipo was done). My PS says to massage this area as it probably is a result of postop lipo healing.My mammogram was done 1 month prior to reduction & was normal.What are the possible causes of this sudden lumpy area? It is rather unsettling to feel any breast clumsiness, but it literally happened post reduction/lipo. Thank you

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