bro, this is pretty wild. it's like i'm looking at a post i was going to make but never did.
i have the exact same type of hair loss (dupa) and the same red-brown circular spots/blemishes on my scalp (my mom has them too btw, along with dupa). hell, i even have the same kind of hair as you.
i've got a perfect nw1 hairline with diffuse loss across the entire scalp and have been slowly thinning for the last decade (i'm 31). i was on propecia for a year a long time ago but it seemed to be ineffective (although i had super long hair back then and might've been hard to tell). did a thyroid panel and it all came back normal besides lowish vitamin d. the guy a few posts back might be on to something in that this isn't classic androgenetic alopecia but rather some sort of chronic Telogen Effluvium and/or some weird fungal growth interfering with the normal hair cycle.
check it out:
https://i.imgur.com/8pJSUyt.jpg (may need to zoom in)
you can see the side of my scalp is in worse shape than the top with many miniaturized hairs. and the same spots as you in various parts of my scalp which seem rather fungal looking, but haven't yet been able to confirm what they are.
https://imgur.com/a/sl8QROQ
look at the sad state of my sides compared to the top, with some weird stripe pattern above the ear.
may or may not be related, but how are you managing stress? i tend to be anxious throughout the day for no apparent reason which might mean something's out of whack hormonally or whatever. i've been like that since around the end of puberty, which was right around the time i noticed hair loss. in any case, we need to work together and get to the bottom of this because there's something weird going on and you're the first person ever in my years of searching that has all the same symptoms.