underarm problem / cyst

H! I am 22 years old, I want to ask if what is this inside my underarm that is painful to touch and move..it's like a round inside but it is not visible outside..I got this when I take a bath after removing hair from  underarm..it is painful at first and got that round inside..it's been 2 years i've got this one.. i go to the  doctor and let it checked..she told me to take the antibiotic she gave me and come back for observation.. i have never come back because of too much work and busy activity at school and I have it until now.. does warm compress will help? or do i need to continue the treatment for doctor? hope you can help me.. thanks

[lyndsey7737]

Definitely see your doctor.. It could be a sweat gland, but definitely check it out imeediately just for your own security of not having to worry about what it is. My mom had the same thing under her arm and it turned out to be a cyst and my husband also had one and it turned out to be a swollen sweat gland.