Dear sheep: Without evaluation, it is impossible to speculate on what may be causing your discomfort. The well known version of lymphedema usually occurs in the arm when the axillary (under arm) lymph
nodesLymph node biopsy
Swollen glands
Swollen lymph nodes in the groin
Swollen lymph nodes under arm are damaged or disrupted causing fluid to pool in the arm. Technically, lymphedema could occur anywhere if there is damage to the lymphatic drainage in an area where fluid pools in a lower (or more dependent area). Lymphedema happens in legs as well. If you feel there is not adequate explanation, you might consider a second opinion, preferably with a breast specialist (often affiliated with large academic medical centers). An breast specialist may also be well equipped to discuss your risk of breast cancer and the appropriate surveillance for your risk.
What was the pathology report from the cyst removal. At any rate, it sounds like you should get an ultrasound at least to see what's going on in there, if anything, now.
thanks for asking.