Hayden Brown was a clinic patient in the Season 1 episode Babies & Bathwater. He was portrayed by actor Guy Camilleri.
Camilleri came to the clinic with heavy rectal bleeding and feared he had cancer. He was seen by Lisa Cuddy who did a quick examination and found he merely had a bleeding hemmorhoid, but she had to continuously reassure him.
As he had his pants down for the examination, Gregory House burst into the exam room to bother Cuddy