Hello. My dosage of estrogen was increased yesterday and I noticed last night that I had a swollen lymph node under my right armpit. This morning, I noticed that it was gone, but now I had one under my left armpit. It is tender and painful to touch, but isn't very red or swollen. Could this just be due due to the increase in dosage yesterday, or is this something I should be worried about? I'm in my teens, so I'm hoping that it's not a sign of a tumor or whatnot. Thanks for all the help!