Hello Sir, I have one lumps or may be boil on skin of scrotum. for last 4 year i have and there size is some thing like half of vegetable pee. in this there is no pain. just like a piece of hard dead muscles. There is no irritation also. Initially when it grow that time i pressed it and i find no pain and in that i see some black colour thing come out. after that it increase and now it is fixed. But my worries is nearby the lump i find 2 new very small lumps also. same as first one. Please tell me what is this and why it happen to me. and how to cure it.