Can you go into more detail as to why cupping is healthy and how it removes the "bad blood", i.e. what you mean by bad blood and why it would remove the bad blood but not the "good"?
I know that donating blood once a year is recommended for men and post-menopause women because too much iron in the body is bad (and menstruating women can eliminate it, as well as other toxins, through menstruation). And I know that "blood letting" was used some time ago...