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Do I have a cyst under my mole?

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?
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.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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