Hello and welcome to healthcare forum.
You have not mentioned reason for breast implant
, which is important to know because if it was done post mastectomy
, due to ca. Breast then this lymph
might be a metastatic one.
If you had malignancy then Your reactive lymph node in the right armpit should be investigated as metastatic if it does not resolve with 3 weeks course of antibiotic.
After 3 weeks course of antibiotic if it does not resolve then go for lymph node excision biopsy
If you had undergone silicon implant for cosmetic purpose then there should be leak from the implant that is drained by the lymph node, making it reactively enlarged. In that case again you have to consult your breast surgeon.
Best of luck.