I have heard of this for applying EMLA cream.  One could also use 
Tegaderm, I suppose, though more expensive and harder to come by.

We have also used something similar with Tegaderm for wound care for 
surgeries for my little one.

Katie Bredbeck
mama and lactivist

"The Truth shall set you free.  But first, it will piss you off."
Gloria Steinham

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