Kindly visit a surgeon It's a bening lesion Get examined We have breast clinic in Mumbai Nair Can visit

Most probably it is benign lesion may cause much problem but you need to check with surgeon

It is unlikely to cause problems during pregnancy, but you need to monitor the size of the cysts by serial ultrasound  examinations to see if it is increasing in Size ....an FNAC or Trucut biopsy ( both are outpatient  procedures with are done in 10 minutes ) will tell us the exact constitution of the cyst if it is benign or not...

Get it removed if painful