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What is causing the painful lump on the base of my skull?

I'm 22 years old and had a C-section just over two months ago. For the last two weeks I've had a hard lump right at the base of my skull it’s about 3/4 in diameter and if I touch it at all I get a shooting headache. I thought it was a muscle but I've tried rubbing it and I've tried taking hot baths to relax but nothing seems to help.
One possibility is that this is just the normal bony bump at the base of your skull that is present in most people, but that you may just have noticed now. Excessive manipulation or pressure on this bump may cause discomfort, and this may be the source of your headache. The other possibility is that you have a small cyst or growth under the skin in this area. If so, it is very unlikely that such a cyst or growth would be a serious problem or would need to be treated, as most growths like this would be entirely benign. The usual treatment is simply to watch them to see if they grow larger. If so, or if the pain worsens, they can usually be removed with a simple surgery that can be performed in your doctor's office just with the injection of some local numbing medicine under the skin. I suggest that you set up an appointment to see your doctors">primary care doctor when able. They will be able to take a look at the bump on your skull and determine what it is and if it is something serious (highly unlikely) that needs further workup or treatment.
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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