I don't know what is is. I have a lump in my grion right now.... I noticed it over a month ago, and went to see my doctor. It didn't hurt and it was the size of a pea. Over the course of a month in shrink a bit in size, but over the weekend, I noticed it again because it became painful, and it was alot bigger than before. I went to my doc this mroning, and she gave me a blood test requisition, for lympoma (sp) I am scared shitless, but I am glas she is taking all the precautions necessary. She said it could very well be a ingrown hair, or infected hair folicle.