Itchy armpit

Hi i was wondering if anyone can help me. My left armpit keeps itching. This has been going on for about 3 years. There is no rash. I mentioned it to a nurse in January of this year. She said she could feel a lump so she got the doctor to have a feel of my armpit. The doctor just said it was a lymph node. Try perfume free deodorant which I did. No change. I stopped shaving my armpit for a while, again no change. Went back to the doctors and he said it was a fungal infection. No rash or soreness. I explained to the doctor that this is affecting my day to day life now. So he gave me some cream to try which again didn't work. I have no other symptoms. My right armpit is absolutely fine. I have tried other creams as well, but none of them are helping. I've also tried antihistamines, again no change. The itch is really intense. I try not to scratch my armpit, but I have to otherwise I don't get any relief. Any advice would be really appreciated. Thank you.