Blood from a diaper rash will be on the skin rather than within the contents of the diaper.
Why Diaper Rash Leads to Bleeding
Urine and especially stool are extremely irritating to the skin.
During that time, it’s possible for you to use over-the-counter treatments for pain relief.

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Continue to follow the home remedy steps above.
Call a healthcare provider if symptoms don’t improve or worsen.
Summary
A bleeding diaper rash is common.

Cleanse their diaper area with warm water, but skip diaper wipes or soap, which can increase irritation.
Johns Hopkins Medicine.Diaper dermatitis.
American Academy of Pediatrics.Common diaper rashes and causes.
American Academy of Dermatology Association.How to treat diaper rash.