how to make transdermal testosterone?

I really like the topicals … I’ve been using them for over 20 years … using a derm roller for the first time to increase absorption rates … I keep the batches to like 10% … after I apply the cream I wait like 10 min and rub some quick drying lotion to help out … when I used to make 20% batches … there would be residue left over on my skin
Where do you apply the cream ? On the scrotum ?
 
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