Hi, @notmoff
I am truly sorry, I named the wrong medication. The medication gel that was prescribed for me was tretinoin. When you mentioned side effects I looked up Voltaren to see what they were and knew immediately I had mentioned an incorrect drug. I was prescribed both of these in the spring of 2019, thus my confusion. Voltaren is for arthritis primarily. It was prescribed for me for bursitis.
Tretinoin is basically Retin A and is most often used for acne but can also be used to help with purpura. Another cream used for purpura is Dermend which is OTC.
This is a fairly good article about tretinoin.
https://ro.co/health-guide/tretinoin-what-is-it-and-what-skin-conditions-can-it-treat/
One thing about tretinoin is that if you are on Medicare it is not covered because it is considered to be "cosmetic". If you use an app like GoodRx you can find much affordable prices.

I hope one of these will help you. Tretinoin did help with my purpura. It did not totally take them away but I had fewer spots and they were not as dark.
Again, I apologize for naming the wrong drug.
JK