However , if the swelling dropped and became black in appearance since it had taken in coldness , the physician had to be cautious when drawing the cold from the swelling .
The feather 's fundament was held to the swelling and would draw out the venom .
If the swelling dropped and became black in appearance since swelling had taken in coldness , the physician had to be cautious when drawing the cold from the swelling .
The feather 's fundament was held to the swelling and would draw out the venom .