When a lymph node becomes swollen, it usually indicates an infection or inflammation somewhere in the body. I am not sure though, why your Doctor prescribed an anti-allergy medication for your condition.
Any lump under the armpit is concerning and should be properly evaluated particularly because you also have a swollen breast. If your Doctor did not order any type of testing, such as a Mammogram or Ultrasound, I would advise you to see a Breast Specialist who will certainly know if more investigation is needed in your case. I don’t think it’s something serious but please ask your Doctor to refer you to a breast Specialist to make sure that you are okay.
Guys can have breast cancer, though it's uncommon. Too many doctors are slow to diagnose breast cancer in males. I'm sensitive to this issue because I had my right breast removed just after I got out of college because of a discharge from my nipple that the doctor thought was probably precancerous. It's probably unlikely that you have breast cancer, but it wouldn't hurt to get a second opinion from a surgeon who sees lots of breast cancer.
You are welcome,
If both Doctors, who examined you, have agreed that the swelling is just muscular then I would not worry much about breast cancer.
However if you have any doubts at all and you are worried, it's essential to “strongly insist” that one of the Doctors orders an Ultrasound so you can have peace of mind.
Since you recently had the flu, it’s very likely that your lymph node has enlarged because of that. Often these nodes take quite a few months to return to their normal size and sometimes they never do .
I have seen the images you have provided but I cannot give you an opinion about the swelling.
Try not to exercise too strenuously for the time being and see if the swelling subsides.
Take care now…
By the way, concerning your nipple puffiness, this could be due to Gynecomastia.
Taking certain prescribed medication which could have steroid properties, or using illicit drugs and even alcohol can cause Gynecomastia in adult men.
Your doctor should know about any type of drug you are perhaps taking, so that it can be replaced with appropriate medication.
I am glad that your Gynecomastia condition is getting better, just take it easy working out for a while and I hope things will improve soon :)
God Bless you too... Merry Christmas and may the New Year 2017, be full of good health and happiness. :)
If the swelling has diminished, it's indeed a good sign! Try not to worry too much, things are improving! :)