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Acne can be manifested in both inflammatory and non-inflammatory forms. Pimples, spots, blemishes, and zits are just a few of the common names of acne. According to research, over 85% of teenagers experience acne, confirming reports that this kind of skin disease is most common during adolescence, with the face and back as the usual thriving area. In some cases, adolescent acne continues into adulthood, generally diminishing over time and appearing again every now and then. In this aspect, acne is said to be unpredictable, with no exact way of telling when they will disappear entirely and for good. Unlike other skin diseases, the main effects of acne are psychological, as manifested by the reduced self-esteem or self-confidence of the sufferer. That is why there are hundreds of products - from medical to alternative - these days that claim to have the power to cure acne. Caution must be exercised in choosing treatments. Athlete's foot, also known as Tinea Pedis and refers to the disease and not the organism, is another kind of skin disease, one that is a parasitic fungal infection that occurs in the epidermis of the human foot and is more common in males than in females. Many dermatophytes or fungi can cause athlete's foot, one of which is the fungi species tinea curis or jock itch. This skin disease usually affects the spaces between the toes, but can also appear in extensive patterns on the bottom and sides of the foot in severe cases. Eczema is a skin disease that is characterized by the inflammation of the upper layers of the skin and includes dryness and stubborn rashes that may be swollen, red, itchy, flaky, oozy, and even bleeding. While scarring is rare, a sufferer of eczema can have temporary skin discoloration from healed lesions. Children may develop nasty habits such as thumb sucking, hair twirling, teeth grinding, nose picking, object biting, compulsive scratching, head banging, self-biting, body rocking, whirling, skin picking and even nail biting. For many, these habit disorders can be outgrown, with the help of parents, teachers or guardians, or even through their own will. There are a few, however, who seem to keep such habits, voluntarily or involuntarily, even during the adult years. One of the most common habit disorder in adults is nail biting. A person who has this problem usually bites or chews on his or her fingernails whenever they are bored, stressed, anxious, or in a very tense environment. According to statistics, nail biting is fairly common in children and adolescents. However, 5% of them may retain the habit throughout adulthood. Possible Causes Of Nail Biting There are many schools of thoughts when it comes to the underlying causes of stereotypic movement disorder, which includes nail biting. Some experts believe that the most common triggers are stress, depression and boredom. Other probable reasons behind nail biting and other habit disorders include drug use (particularly amphetamines and cocaine), major psychiatric disorders, brain diseases, mental retardation, and sensory deprivati