I'm sorry to hear about the discomfort you're experiencing with anal itching, especially since it worsens in the evening and at night. This symptom can be caused by several factors, including irritation, infections, or parasitic infestations such as pinworms.

One common cause of nighttime anal itching is pinworm infection, which often requires specific anti-parasitic treatment. A medication containing albendazole, commonly used to treat various parasitic infections, might be considered under medical supervision.

Here are some general self-care tips you can follow to help relieve the itching:

• Maintain good hygiene by gently cleaning the anal area with warm water and mild soap daily.
• Avoid scratching to prevent skin irritation or secondary infection.
• Keep the area dry and wear loose, breathable cotton underwear.
• Change bed linens and underwear regularly.
• Trim fingernails short to reduce skin damage if scratching occurs.

Since anal itching can have multiple causes, including infections that require specific treatment, I strongly recommend consulting a gastroenterologist or a dermatologist. They can perform a proper examination, possibly recommend stool tests or other investigations, and prescribe appropriate treatment tailored to your condition.

If you notice additional symptoms like bleeding, severe pain, or persistent discomfort, please seek medical attention promptly.To narrow down potential causes, we will need some more information.I understand you're dealing with anal itching that gets worse in the evening and at night. To assist you better, could you please share your age and gender?