Medicinenet.Com explains that pus is a common consequence of a variety of bacterial infections of the skin. When the bacterial pus enters the bloodstream, antibiotic treatment is needed. Skin infections that manifest with pus typically also need antibiotic treatment, and can also be treated with warm compresses.
Infections that cause pus drainage include boils, inflamed hair follicles and impetigo, a skin condition caused by strep bacteria. According to WebMD, boils are painful, pus-filled skin infections that can be treated with warm compresses that help to drain the pus from the infection by drawing it up to the surface of the skin. Once the pus has drained, it is important to clean the area with antibacterial soap and apply a topical antibiotic to the affected area in order to prevent infection. Boils typically clear up within 10 days, but it is important to seek medical attention if a second boil appears or the boil does not completely drain. Additional signs of severe infection include fever, swollen lymph nodes and red streaks surrounding the boil.
The New York State Department of Public Health explains that methicillin-resistant Staphylococcus aureus, or MRSA, is a severe bacterial skin infection that causes red, pus-filled bumps on the skin. As the pus drains, the disease can be easily transmitted from person to person through casual contact. It is extremely important for individuals with MRSA infections to seek immediate medical assistance and not attempt to drain the pus from the sores on their own. MRSA is treated with antibiotics.