Hi,
Welcome to HCM!
This is Dr. Sridhar and I shall be answering your question.
Well, from your description, it appears that you have an
abscess in your underarms. Abscess is a localised collection of pus, occurring as a result of infection. Those whiteheads represent pus points.
There is no need to worry as these are completely curable. If I were your treating doctor, I'd prescribe you an antibiotic course.
If the collection of pus is more, it might need a
drainage by aspiration or incision.
Abscess are often accompanied with
fever, for which you might need anti pyretics.
For temporary pain relief, hot fomentation and pain killers will be useful.
To prevent its recurrence, ensure you maintain proper hygiene and have a good nutritious diet.
Hope this information helps. Feel free to ask if you have any doubt.
With regards
Dr Sridhar