My boyfriend was yesterday in hospital because of a swollen and very painful testicle,he was told it was a infection but doctors were not clear if it was a sti or not, he was given antibiotics pain killers and sent home. Today he has woken in more pain and more swelling,he is going back to hospital today. They said he hadn't twisted his testicle even though he wasn't give a ultrasound, im now worry that it could be a sti even though im myself have no symptoms, how do will we know what it is and if I myself will need treatment?