A ???? is a person who treats ill people by giving extremely small amounts of a substance that causes the disease. (Cambridge and Longman dictionaries)
A ???? is the humorist of the medical profession. (Devil’s Dictionary)
I was going to suggest sadist but this is probably not a registered job description – although after my last trip to the dentist I’m not so sure – homeopath sounds better I think.
Ictwelcome!! 
Hello Carmen,
Is this person a homeopath?
Yes, got that!!
Hi Carmen,
I would not have guessed. I was thinking of someone who invents and/or uses vaccines injecting small amounts of a disease into people.
Hello Carmen,
Yes, I didn´t guess it,either. Congratulations Lillian!
Anna
Hi Carmen and Joanne,
My guess derived from my using homeopathic medicine (for a number of years now) as conventional ones aggravate my stomach!
I was going to suggest sadist but this is probably not a registered job description – although after my last trip to the dentist I’m not so sure – homeopath sounds better I think.