Firstly many doctors think miniturisation is only caused by dht. But they are wrong miniaturisation can also happen with alopecia areata. You can check articles.
I think you are probably slowly thinning and maybe you think you benefit from Propecia? I didn’t find the picture of anyone who benefited from propecia.
Why I think it’s not dht related?
1-Many guys who posted on hairloss forums about dupa 80% of the cases didn’t benefit from dht blockers.
Even the doctor which claims 50% cases benefit from propecia don’t have pics to us to provide evidence...
2-A year after the start of my dupa I started to have vitiligo. If you search articles alopceia areata and vitiligo have similar pathogenisis. Both autoimmune related.
Thanks for the detailed reply. I notice that you mention alopecia areata, but that's not the same as DUPA, is it?
In my understanding Alopecia areata is baldness in patches, and thought to be due to auto-immune causes, while DUPA is a form of androgenetic alopecia with overall thinning (so following the same mechanisms as "normal" male pattern baldness except no zone is safe from DHT as our hair in back and on the sides isn't DHT resistant).