relates to "technical types" including: dry, wet, massage, and flash cupping therapy. The second categorization relates to "the power of suction related types" including: light, medium, and strong cupping therapy. The third categorization relates to "the method of suction related types" including: fire, manual suction, and electrical suction cupping therapy. The fourth categorization relates to "materials inside cups" including: herbal products, water, ozone, moxa, needle, and magnetic cupping therapy. Further categories of cupping were developed later. The fifth relates to area treated including: facial, abdominal, female, male, and orthopedic cupping therapy. The sixth relates to "other cupping types" that include sports and aquatic cupping. Dry cupping Dry cupping involves the application of a heated cup on the skin of the back, chest, abdomen, or buttocks. The cooling of the air is then thought to create a suction effect. Bamboo and other materials are sometimes used as alternatives to glass cups. Fire cupping Fire cupping involves soaking a cotton ball in almost pure alcohol. The cotton is clamped by a pair of forceps and lit via match or lighter, and, in one motion, placed into the cup and quickly removed, while the cup is placed on the skin. The fire heats up the air in the cup which, after cooling reduces in volume creating a negative pressure inside the cup. The cup is then quickly placed onto the body and the negative pressure "sucks" the skin up. Massage oil may be applied to create a better seal as well as allow the cups to glide over muscle groups (e.g. trapezius, erectors, latissimus dorsi, etc.) in an act called "gliding cupping" or "sliding cupping". Dark circles may appear where the cups were placed because of capillary rupture just under the skin. There are documented cases of burns caused by fire cupping. Wet cupping Wet cupping is also known as Hijama ( lit. "sucking") or medicinal bleeding, where blood is drawn by local suction from a small skin incision. The first reported usages are found in the Islamic hadith, sayings attributed to or describing the actions of the Islamic prophet Muhammad. Hadith from Muhammad al-Bukhari, Muslim ibn al-Hajjaj Nishapuri and Ahmad ibn Hanbal support its recommendation and use by Muhammad. As a result, wet cupping has remained a popular remedy practiced in many parts of the Muslim world. In Finland, wet cupping has been done at least since the 15th century, and it