<P> Injection into the subcutaneous tissue is a route of administration used for drugs such as insulin: because it is highly vascular, the tissue absorbs drugs quickly . Subcutaneous injection is believed to be the most effective manner to administer some drugs, such as human growth hormones . Just as the subcutaneous tissue can store fat, it can also provide good storage space for drugs that need to be released gradually because there is limited blood flow . "Skin popping" is a slang term that includes this method of administration, and is usually used in association with recreational drugs . </P> <Ul> <Li> Subcutaneous abscess </Li> <Li> Subcutaneous tumor </Li> </Ul>

What are the functions of the subcutaneous layer and is it considered a layer of the skin