I live in Dallas, TX, USA and here the Muslim community is involved in "Hijama" It is very popular here and people say that it is Hijama and everyone should do it regularly. In Hijama they remove the blood of the body by making small cuts on skin and sticking vacuumed cups on different parts to suck the blood. The people who do that say it is a Sunnah and it is a remedy of many diseases. They say that Prophet Mohammad (peace be upon him) used to do it regularly. I need to know about the concept of Hijama and if it is indeed a "Sunnah".