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Small bump on upper arm with small grey dot, white pus came on squeezing. What is it?

I have a small bump on my upper arm with a small dark grey/black dot. I thought it was a blackhead . And squeezed it and white pus came out. The more I squeezed the darker it got till it was black. The pus is a weird stringy and almost cottony if that makes sense. And I don t know if I should go to a doctor. Please help.
Asked On : Sun, 13 Jan 2013
Answers:  1 Views:  166
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Pain Medicine & Palliative Care Specialist 's  Response
This could be a sebaceous cyst. The contents that come out when it is squeezed are often whitish and creamy in consistency. There is a risk that it becomes infected if you squeeze it. In which case it would become painful and red and I would advise a visit to your doctor. If it does not become infected then you need not do anything but I would advise you do not squeeze it anymore.
Dr K A Pottinger
Answered: Wed, 24 Jul 2013
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