Can salicylic acid cream can be used in piles?/hemeroids? and what is the percentage?

No. You should not use salicylic acid cream.
Hemorrhoids / piles are painful, swollen veins in the lower portion of the rectum or anus. Over-the-counter corticosteroid creams can reduce pain and swelling. Hemorrhoid creams with lidocaine can reduce pain. Witch hazel (applied with cotton swabs) can reduce itching. Talk to your pharmacist for advice.

Read more: https://www.drugs.com/health-guide/hemorrhoids.html#ixzz131u9VfMo

Salicylic acid cream is indicated in treating acne. It may also be used for other conditions as determined by your doctor.

Salicylic Acid Cream is a topical salicylate. It works by causing the skin to swell, soften, and then slough or peel in areas where it is applied.

Read more: https://www.drugs.com/mtm/salicylic-acid-topical.html#ixzz12ykbNdv1

For piles & or hemeroids would recommend to seek medical advice, please, take care.