Over 65 Days After Surgery I Get a Seroma - Could I Have Caused It by Heavy Lifting? (photo)

hi there - i had a tummy tuck, lipo and breast reduction and lift over 65 days ago and out of the blue a seroma has developed just above my tummy tuck inscision - is that odd? and could I have caused it by heavy lifting too soon? its the size of a small flat fist, tender but thats all - but is it normal so long after and could i have caused it? after reading various responses I understand the treatment and maybe i should start wearing my body garment again but i just dont want to aggravate it!