What is including among the signs of a perirectal abscess?

The presence of discharge of blood, pus, or mucus is a key indicator of a perirectal abscess. This type of abscess occurs in the tissue surrounding the rectum and is often a result of an infection, typically originating from an anal gland. The accumulation of pus in the abscess leads to inflammation and can cause pain, swelling, and systemic symptoms such as fever.

The discharge of pus, in particular, signals that the abscess has become filled with infected material, which is a common finding in these cases. Furthermore, the discharge can help differentiate a perirectal abscess from other conditions that might present with similar symptoms but do not involve the formation of pus.

In contrast, pain without swelling does not typically align with the expected findings of an abscess, as swelling is a common and notable symptom due to inflammation. Swelling accompanied by fever indicates a more systemic response to infection, but it is not as definitive as the presence of pus or discharge for diagnosing perirectal abscess. Therefore, the discharge of blood, pus, or mucus serves as the most specific sign indicating the presence of a perirectal abscess.