PRP scalp injections numbing solution?

It’s best you have your provider apply the numbing creams before the procedure. It would certainly be more effective than whatever you can but in the market.

Numerous numbing preparations can be used for PRP injections. 20% lidocaine as well as Emla cream have been reported. In my opinion, if the injections are given using the subdermal depo technique, soreness and pain are minimal. Some studies on this technique rate the pain  as a 2 out of 10. One can also add a cool air blower such as the Zimmer Chiller to decrease sensation. We have also used a new device called ProNox. This is a new combination of lower dose nitrous oxide and oxygen to produce significant analgesia. Find a PRP expert. Ask to see photos.
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It is possible to use topical creams and distractions such as vibrators to make the injections less painful.  A skillfully placed regional block may provide good results as well as slowly injecting around the area with lidocaine type solutions.  Technique, rather than product, will provide the most benefit.  Make sure you find someone who does many procedures such as this for best results.