Testicle lump but only when ejaculate

Jade

Hi me and my boyfriend are ttc and have noticed after we have DTD there is a lump at the side of his testicle then it goes away

Only seems to be there after ejaculation, has anyone else had this is this normal and does it effect fertility

Ive told him to go to the doctors but would be good to know if anyone has had this?

Please help