Pus on the head is caused by a bacterial infection. In addition to pus, an infection on the head can cause inflammation, pain, and redness. An infection that produces pus is also referred to as a purulent infection and can also cause body aches, chills, fever, vomiting, and general malaise. Treatment for pus on the head depends upon the cause of the infection, but usually includes oral or topical antibiotics, or a combination of both.

An ingrown hair, boil, or staph infection can cause pus on the head, and scalp oils and hair products can sometimes worsen the infection. Until the infection resolves, patients should wash the hair with gentle shampoo and avoid using hairsprays or other styling products. Also, pus on the head should not be tampered with, nor should the an individual attempt to drain the pus, because doing so may cause the infection to spread. Vigorous brushing or combing the hair should also be avoided to prevent irritating the area and possibly causing permanent damage to the tissue.

The consistency and color of pus on the head can vary. It can range from thin to very thick and sticky, and the color can range from light to dark. Pus can also appear green or brown, or it may look red or pink when it mixes with blood. Neither the color nor the consistency of pus should be used as an indicator of the severity or type of infection. Pus can also have a disagreeable odor to it, but the health care provider can recommend an antibacterial wash to alleviate the smell.

If pus on the head is caused by an abscess, the health care provider may elect to drain or lance the abscess. Depending upon the size and location of the abscess, the hair may be trimmed or shaved. In most cases, the hair will grow back. If the abscess is deep or extensive, however, damage to the hair follicles may occur, causing the hair to stop growing permanently.

When pus escapes from the abscess, close contact with others should be avoided until the health care provider has treated or contained the infection. Since the scalp is very vascular, it may bleed profusely after the health care provider lances or drains the abscess. The bleeding will subside gradually, but if it becomes persistent, further treatment may be necessary to close the wound, such as the application of a special dressing or stitches. After the infection has been treated, it generally heals completely and uneventfully.