What causes perianal eczema after anorectal surgery?

After anorectal surgery, the occurrence of perianal eczema may be caused by various factors including individual skin sensitivity, drug allergies, constipation, anal sphincter relaxation, and infection. If any abnormalities occur, prompt medical attention is recommended. The specific analysis is as follows:

1. Individual Skin Sensitivity

Some individuals may have heightened skin sensitivity due to personal differences, making them more prone to contact dermatitis from postoperative dressings, disinfectants, or medication components, which can manifest as perianal eczema. It is advisable to avoid known allergens.

2. Drug Allergy

Patients undergoing anorectal surgery may need to take certain medications. If an allergic reaction occurs, it can trigger a hypersensitivity response leading to inflammatory skin reactions in the perianal area, potentially causing eczema. Once a drug allergy is identified, the medication should be discontinued immediately.

3. Constipation

Following anorectal surgery, patients' intestinal function may be temporarily impaired, leading to issues such as constipation. This may increase intestinal secretions that irritate the perianal skin, possibly accompanied by symptoms like bloating and abdominal pain. Dietary adjustments based on medical advice—such as consuming more fiber-rich foods—can help promote intestinal motility.

4. Anal Sphincter Relaxation

Poor recovery of anal sphincter function after anorectal surgery may lead to anal sphincter relaxation, reducing bowel control. This can result in contamination of the perianal skin by feces or anal secretions, triggering eczema, and may also be associated with fecal incontinence and a sensation of incomplete evacuation. Doctors typically recommend physical therapies such as pelvic floor muscle exercises, along with agents like povidone-iodine solution, compound Phellodendri Chinensis decoction topical preparation, and Bifidobacterium triple viable capsules to regulate intestinal flora and reduce irritation from secretions.

5. Infection

If surgical wounds are not properly managed after anorectal surgery, infections may develop, causing inflammatory reactions in the perianal skin. This compromises the skin’s barrier function, leading to loss of moisture and nutrients, which may result in eczema. Symptoms may include redness, swelling, pain, and fever. Treatment should follow medical guidance and may involve antibiotics such as amoxicillin capsules, cefradine capsules, or erythromycin ointment to control the infection.

Patients should maintain good daily habits and a healthy, scientifically balanced diet, actively optimizing their physical condition to ensure effective postoperative recovery.