Swollen lymph nodes. You have lymph glands in your under arms, and they can become sore, sometimes you can even feel a knot, if your body is fighting on infection or illness. Not much you can do about it, just wait for it to go away.
Also it could be cellulitis which is an infection in the dermal and subcutaneous layers of the skin. The most common reason why it forms in the armpits is bacteria gets into the skin via small cuts from shaving your armpits. See your doctor, and he/she will give you penicillin to take.
Bumps in your armpits may be from a variety of causes. It could be swollen lymph nodes. They may also be caused by razor burn from shaving.
it could be ingrown hairs
Ingrown hair most likely.
Under your armpit could be breast cancer. It is best you go see a doctor.
what would it be with a lump under the armpit
No, they will just have a very very sore arm.
iron
There are a number of things that would cause sore feet after sleep. This is mainly attributed to poor circulation of the blood to the feet among other causes.
The sore knot is a lymph node. Its relation to your cycle suggests a chance of breast cancer. See a doctor and get a biopsy.
If you get punched in the jaw then that can cause sore jaws
Yes. A vaccine shot will make your immune system go into overdrive. A part of the immune system are the lymph nodes, and two of them are in the armpits. If they are active, they swell, which can lead to soreness.
stress on the musles, like pressure
The white circle in your armpit could indicate a fungal infection. A fungal infection would cause symptoms such as pain and itching. The only way to know for sure what it is to seek medical advice from your doctor.
Sore veins in your hand won't cause a disease.