Three times now over a period of about 3 1/2 years, I have noticed a hardened gland like spot in my groin area. It gets about the size of a grape, and very stiff. Always in a different spot. After a week or so, it goes away. Once right under the skin, the other two times a little deeper. I have always been careful about avoiding STD s, am a regular blood donor, and looking to donate a kidney. I am Female, almost 31. Is this a common occurrence thing, or something to be concerned about?