How to treat perianal abscess?

Written by Xiao Zhi Guo
Colorectal Surgery Department
Updated on September 11, 2024
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Perianal abscesses generally have two treatment options. Initially, if the abscess is not very large and the swelling and pain are not particularly severe, conservative treatment with antibiotics can be used temporarily. If conservative treatment is ineffective and the swelling worsens, surgical treatment may be necessary. In cases of severe abscesses, incision and drainage can be considered first, followed by antibiotic treatment. Surgical definitive treatment can then be performed 3-5 days later.

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How to find the internal opening of a perianal abscess?

The internal opening of a perianal abscess is mainly identified through digital rectal examination and with the aid of a probe and perianal ultrasonography. Typically, during the onset of a perianal abscess, there is noticeable redness, swelling, heat, and pain around the anus. Inside the anal canal, digital rectal examination and anoscopy reveal swollen mucosa at the anal crypt, accompanied by the discharge of pus. Using a probe for exploration can clearly identify the presence of the internal opening locally. Once the internal opening of a perianal abscess is located, prompt surgical treatment is necessary. Surgery for perianal abscesses generally involves a one-time radical procedure complemented by incision and drainage. If an internal opening exists and involves the sphincter, further surgery involving incision, drainage, and seton placement may be required.

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Colorectal Surgery Department
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How to change dressings for perianal abscess during menstruation?

Dressing changes during menstruation for perianal abscesses require cleansing with warm water after defecation. Sitz baths are not recommended as they may lead to gynecological infections. After thoroughly cleaning the area, it can be wiped with iodine. A hemorrhoid suppository should then be inserted into the anus, and hemorrhoid cream or an anti-inflammatory ointment can be applied to the wound. Covering with a piece of gauze can have an anti-inflammatory and antibacterial effect. Secure it with adhesive tape, and decide the frequency of dressing changes based on the amount of wound excretion. If there is a lot of excretion, it is advised to change the dressing twice a day, in the morning and evening. If the excretion is minimal and there is no feeling of moisture or discomfort, changing the dressing once a day after defecation is sufficient. At the same time, pay attention to a light diet.

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Why does a perianal abscess recur?

Perianal abscess is an infectious disease of the local skin and tissues around the anus caused by an infection in the anal crypts. If a perianal abscess is not treated with a definitive one-time surgical intervention, it is very likely to recur, or after rupture of the abscess, to form an anal fistula with long-term intermittent discharge of pus from an external opening. Therefore, during the acute phase of a perianal abscess, once a distinct abscess cavity and pus formation occurs, it is necessary to promptly perform a one-time definitive surgical treatment of the perianal abscess, rather than choosing conservative medication treatment or simple incision and drainage. The above treatments only temporarily alleviate symptoms of a perianal abscess; only a one-time definitive surgery that completely cleans the local wound can result in the complete healing of the perianal abscess.

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Colorectal Surgery
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What should I do if the perianal abscess bursts?

Since a perianal abscess is an acute symptom of a local skin infection around the anus, during the acute phase of a perianal abscess, an abscess cavity and pus formation generally occur within about a week. As the disease worsens and progresses, the perianal abscess will rupture about a week later. If the perianal abscess ruptures, it may have already formed an anal fistula. A perianal abscess and an anal fistula represent two different stages of the disease, and both require surgical treatment. The main surgical treatment for anal fistulas is fistulotomy with seton placement, and care must be taken to drain and disinfect the local wound post-surgery to prevent pseudohealing of the wound.

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Can a perianal abscess heal by itself?

During the acute phase of a perianal abscess, there is significant local redness, swelling, heat, and pain around the anus. Generally, this condition is caused by an infection of the anal crypts, and the possibility of self-healing is very low, so the main treatment for a perianal abscess is surgery. The surgical approach usually involves incision and drainage of the perianal abscess, combined with a one-time curative surgery. If the abscess ruptures and forms an anal fistula, surgical treatment is also required. During the outbreak of a perianal abscess, due to the severe local pain, it is advisable to undergo surgery as soon as possible to prevent further spread of the abscess. Simple topical medications can only relieve the symptoms of local inflammatory infection and cannot achieve a cure.