Worried about husband!!!

Ok ladies, please help me. My husband had me feel this lump he has on his bum tonight. It’s like off to the left of his bum crack and it’s a hard lump. He say’s it’s not painful at all. I know we aren’t doctors, but do you think this is something to be worried about?? Should he see a doctor for it? I’m worried it may be like tumor or something. The pictures are the general area that it’s located.