The triceps brachii are the muscles of the upper arm that connect to the bones of the arm. Working opposite to the biceps, the triceps are responsible for extending the arm, which it does by pulling on the ulna at the elbow. Injuries often result from lifting too much weight or performing repetitive movement. Failure to properly warm up before exercise increases the risk of injury, as does obesity, poor diet and overdevelopment of the biceps. These toe problems develop over years and are common in adults. Women have more of these problems than men because of the types of shoes they may wear, such as high heels. Acne (pimples) is caused when grease (or oil) builds up around a hair follicle, blocking a pore of the skin. When dead skin cells or certain bacteria get into these clogged pores and irritate or inflame the skin, a lesion occurs, which is generally referred to as acne. Oil secretions, which lead to pimples, tend to increase with hormonal changes and stress. Skin growths called moles occur anywhere on the skin. When nevus cells, containing the pigment-producing substance melanin, grow in a cluster they produce moles and pigment on our skin. Moles, often harmless, can become malignant, however, creating a danger skin cancer called melanoma. As of 2002, the incidence of claw and hammer toe deformities ranges from 2–20% of the population in the United States, with the frequency gradually increasing in the older age groups. Claw and hammer toes are most often seen in patients in the seventh and eight decades of life. Women are affected four to five times more often than men. Little is known about the incidence of these deformities among people who usually wear sandals or go barefoot. All corrective toe procedures usually have good outcomes in relieving pain and improving toe mobility. They restore appropriate toe length and anatomy while realigning and stabilizing the joints in the foot. The effects of alcohol and drug addiction on the U.S. economy is substantial. Combined costs for health care, criminal processing and worker productivity are more than $500 billion a year. So far, solutions to these problems have seen inconsistent results. Research developments within these areas are exploring more integrated models of behavioral and physiological approaches to treatment. The liver fights infection, digests food, cleans the blood and stores energy. Liver disease in humans is a gradual process that can be life threatening if left untreated. There are a number of causes for liver disease, including hepatitis and excessive alcohol consumption. A bone spur is an affliction that occurs when a small bone forms on a regular bone. Bone spurs and arthritis are most common to adults in their older years, especially those with a diet lacking in calcium. Although bone spurs themselves don't hurt, they often form in places that rub against other bones and tendons, causing intense pain at times, as does arthritis. A tendon is a bodily tissue that connects muscle to bone. When a tendon becomes inflamed and painful, a condition called tendonitis results. Although many treatments exist to heal tendonitis, use of an ultrasound is one of the best ways to speed the healing process. Sinusitis is an infection in or inflammation of the sinuses. An estimated 37 million Americans get sinusitis every year and spend $5.8 billion annually for sinusitis-related health care costs, according to the National Institute of Allergy and Infectious Diseases. Several home remedies can be as effective as a trip to the doctor for a prescription. The Mayo Clinic recommends self-care solutions that will alleviate most cases of sinusitis. Hammertoe is a condition in which the middle toe joint is bent and causes the toe to curl. Mallet toe is also bent but affects the upper toe joint. The two conditions have similar causes, symptoms, and treatment.