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Medical questions & health advice by board certified doctors

"Do I have a cyst under my mole?"

ZocdocAnswersDo I have a cyst under my mole?

Question

There is a little bump under a mole on my arm that has started oozing through the mole. Is this a cyst? What should I do about it?

Answer

I highly recommend that you go to see your doctor about this right away. You could see either your primary care doctor or a dermatologist for help. Moles are collections of pigmented cells in the skin called melanocytes. They are usually benign, but sometimes there is a risk that they will transform into melanoma, which is a dangerous form of skin cancer. For this reason, anytime a mole begins to behave suspiciously (change in size, color, texture, etc) it needs to be examined to make sure it is not turning into a melanoma. The fact that you have recently had a bump develop under your mole and that it is now oozing is concerning to me, and I think you need to have your doctor look at it to make sure it is not a cancer. After examining the mole closely on your arm, if your doctor is worried they will want to perform a biopsy. This is a simple office procedure in which numbing medicine is injected around the mole and the mole is removed so that it can be examined closer under a microscope, looking for evidence of cancer. Set up a visit with your doctor as soon as possible.

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