Woke up and under my arm is really sore!?

Question

there is what looks like a red lump in my armpit, and it is very very tender. I am going abroad tomorrow, should i try and see the doctor today. It wasnt there last night, it has just appeared with a passion!!!!

Answer 1

It could be:

1. A boil (deep skin infection).  

2. A swollen lymph node, which could also indicate an infection of some type.

3. A bug bite of some type.

If you are going abroad you should probably get it checked out before you go.