I am a 23 yr. old male. I noticed a small lump
located on my scrotum. It is not on the testicle, it is located on the skin. It is about the size of an M&M, with a slight redness on the outside skin of the scrotum. It did not hurt, but as i have been examining it, it has started a sort of throbbing pain, scale of 1-10, 10 being most painful, it is a 3 or 4 . I have had only one girlfriend for the past year and neither of us has any STD's.