How long will lymph nodes be swollen after an augmentation? (Photo)

I am 18 days post op. 400cc hp mentor smooth round placed under the muscle with an inframmory incision. I was a 32a befoe. During my massageing, I noticed some tenderness near my underarms. I was feeling around in that area and noticed that I have one swollen lymph node under each arm. They do not hurt in general but are tender to the touch. Also when I get in the shower and the warm water hits that area, they tend to ache more. How long does it take for the swelling of the to go down?

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