Final answer:
The safe maximum temperature when warming a dermal puncture site is 42°C to avoid tissue damage and burns.
Step-by-step explanation:
When warming a dermal puncture site, the temperature should not exceed 42°C as per standard safety practices to prevent burns and tissue damage. The average normal body temperature is usually given as 37.0°C (98.6°F), and the body's thermoregulation is primarily controlled by the hypothalamus. Exceeding a warming temperature of 42°C can result in the final temperature rise being unreasonably large, potentially causing harm to the patient.