6. See a doctor if the boil has not drained within two weeks, or has become infected. In some cases, medical treatment will be required to deal with the boil, due to its size, location, or infection. A doctor will need to lance the boil, either in his/her office or in surgery.
How do cells dispose of unwanted organic material? Although food has been broken down into individual molecules by the time it reaches a cell, cells still need to deal with larger complexes of organic material. Intracellular digestion is carried out by organelles called lysosomes. There are several contexts in which cells need to carry out digestion.
For unicellular organisms, this provides a method of obtaining nutrition to feed the cell. Another use of intracellular digestion is in the immune system, where cells can engulf bacteria, viruses, and other foreign particles and break them down to neutralize them, eliminating potential sources of infection. There are two kinds of intracellular digestion.