I would suggest that you see a dermatologist. This specialist will probably be able to identify this lesion or may decide to remove it and studied by a pathologist. It may be some type of granuloma and a basal cell carcinoma would be important to rule out.
I hope this information is helpful for you. Follow up questions are welcome if you have any.
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Anthony Bray MD
I saw your follow up question on the feedback section. The naval is not a common area for a malignant growth. It is a common area for a hernia to occur. Your description of it being firm made me think it unlikely to be a hernia. It is a common area for fungal infections and some skin disorders can occur here that you might be surprised , psoriasis for example. The firm hard lesion is not consistent with psoriasis and from the description I can not give you any definite diagnosis.It might be an exuberant growth of scar type tissue, this would be a fibroma. A granuloma is a chronic inflammatory lesion that occurs with certain indolent infections that the body fails to eradicate but controls it and walls it off. With the location this possibility came to mind but you need to see a dermatologist in order to diagnose this.
I hope this helps to clarify some. Further questions are welcome if you have any.
PS in response to your last question, I don't feel that it is URGENT but neither would I put this off. Try to get in to see a dermatologist within the next week or so. If the dermatologist feels that it is a result of a deeper problem then he/she might refer you on to say a general surgeon. I understand what you are saying thet it seems to originate deep to the skin but I still feel that the dermatologist would be a good next step. If your Gynecologist did not see reason for concern and they do surgery through the naval then I don't think a surgeon should be your next stop. I get the impression that your gynecologist probably did not know what this was but had the feeling that it appeared benign. I agree with you that itching and pain are suspicious behavior that this lesion has that should be evaluated further.
You are very welcome; I'm glad that I was able to help!