What are the dangers/side effects of tummy tucks (witch hazel)?

Many. Some of the many risk/potential complications associated with tummy tuck surgery include: infection, bleeding, abnormal scarring, wound healing problems, asymmetry, tissue necrosis, intra-abdominal injury, deep venous thrombosis, pulmonary embolism, and even death. Careful selection of plastic surgeon, anesthesia provider, and surgical facility all very important.
Always risks. Any surgical procedure carries risks, and tummy tuck is no exception. Most commonly we talk about bleeding, infection, scarring and blood clots. The things you can do to minimize your risk is to see a board certified plastic surgeon, be honest about your medical history and expectations, and optimize your health and weight before surgery.
Safe procedure. A tummy tuck is generally considered a safe procedure in a healthy patient. Complications include bleeding, infection, bruising, swelling, and delayed wound healing. Severe complications are rare.