The need to drain a 1cm abscess in the body depends largely on the depth of the location of the abscess. Generally speaking if it is a suppurating abscess of about 1cm, commonly known as a pustule, just located in the skin or subcutaneous tissue layer is very shallow, usually need to incise the abscess and drain the pus can be. It is important to note that superficial abscesses are relatively small, only 1cm in size, but the abscess cavity is very deep, such as perianal abscess, deep abscess is very large and the skin surface of the abscess is very small, only 1cm in size, this time in addition to incision of the abscess after the usually need to be placed in a tube to do drainage. So whether an abscess 1cm in size needs to be drained depends mainly on the depth of the abscess, if it is deep then it usually needs to be drained.