An adhesive bandage, also called a sticking plaster (and also known by the genericized trademarks Band-Aid or Elastoplast) is a small dressing used for injuries not serious enough to require a full-size bandage. "Band-Aid" is the common American English term, while "plaster" is the term in British English usage.
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The adhesive bandage protects the cut, e.g. from friction, germs, damage, or dirt. Thus, the healing process of the body is less disturbed. Sometimes they have antiseptic properties.
An adhesive bandage is usually covered by woven fabric, plastic, or latex rubber which has an adhesive. Adhesive bandages usually have an absorbent pad, which is sometimes medicated with an antiseptic solution. Some bandages have a thin, porous-polymer coating over the pad to keep it from sticking to the wound. The bandage is applied such that the pad covers the wound, and the fabric or plastic sticks to the surrounding skin to hold the dressing in place and prevent dirt from entering the wound.
Special bandages are used by food handlers. These are waterproof, have strong adhesive so they are less likely to fall off, and are usually bright blue in color so that it is obvious to the wearer if it has fallen off into some food. They are also detectable by special machines that are used in food manufacturing plants to ensure that food is free from foreign objects before it is shipped to the public.
Transdermal patches are adhesive bandages with the function to distribute medication through the skin, rather than protecting a wound.