My impla is are under the muscle.i did feel the lump kinda move.i was nervous because I had 3 lumps and a mass re.oved a year prior...they were ok,but discovered i have lcis.i have been having issues with lumps for the past several years out of nowhere.i was advised it is hormonal due to perimenapause.i go for sonogram and mammogram every 6 months and mri yearly for past 3 years.i've had quite a few cysts and we have just watched them.i have had 2 removed because I was nervous.i have seen an oncologist and I finally decided to try tamoxifin after 2 years of resisting...I was nervous about side effects.trust your gut..ask questions..and get 2nd opinions if you don't understand what's happening. I wish you luck.thankfully cysts are usually nothing,but always something you should have checked out.i am 53 yrs old and these have become an issue only in the past 4 yrs.i have always did a yearly mammogram since 35 and sonogram due to dense breast tissue.hope I helped.