Hello,
Thanks for posting your query at DoctorSpring.com
Its not possible for a fecal contact to have any effect on ones looks.
Your friend hold a false belief and he seems he is quite fixed about
it. Now the questions comes about the insight. If he feels his
thoughts are unnecessary but still he cannot control them, then it
could be an OCD. OCD will require treatment with medicines such as
fluoxetine ot fluvoxamine in high doses and the symptoms will start
resolving in 2-3weeks.
However if he has no insight and feel his thoughts are right and feels
they need to be there for his safety, then probably its a psychosis
and will require anti-psychotics like olanzapine or risperidone or
haloperidol etc. These anti-psychotics will help in resolving the
symptoms.
Do meet your doctor and get him properly interviewed. He needs
psychiatric treatment and he will get better.
Hope I am able to answer your concerns.
Wish you good health!
Dr. SRikanth Reddy MD