I recently came across a story where Boudreaux's Butt Paste was used for post spanking relief. To my surprise, it is a real product. It was originally invented for diaper rash, but now is used to treat "various skin ailments including psoriasis, jock itch, shingles, cold sores and acne".
http://en.wikipedia.org/wiki/Boudreaux%27s_Butt_Paste has the information on this product, including its basic formula (zinc oxide, a blend of Peruvian balsam, castor oil, mineral oil, Paraffin, Petrolatum)
Now I'm wondering about the "butt paste". Has anyone ever heard of this being used for post spanking pain relief or did the author of that piece take a random skin care product and use it in a story?