<qa>  What is the name of the procedure that involves the skin over the hipbone and the outer surfaceParticipants will have a medical history and physical examination; various blood tests, including studies to identify genetic changes that are important in the growth, development, and functioning of human mast cells; and bone marrow aspiration and biopsy. For the bone marrow procedure, the skin over the hipbone and the outer surface of the bone itself are numbed with an injection of local anesthesia. Then, a special needle is inserted into the hipbone and about 2 tablespoons of bone marrow are drawn into a syringe. Another needle is then inserted through the first needle to collect a small piece of the bone marrow. Pain will be managed according to the individual patient s needs. Additional procedures, such as a gastroenterology consultation, colonoscopy to examine the colon, or computerized axial tomography CT or ultrasound of the abdomen to assess the liver and spleen, may be done if medically indicated. Standard medical treatment, including antihistamines for itching or steroids for abdominal cramping or diarrhea, will be recommended as appropriate. 