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In my opinion, I don't believe there's any interaction between finasteride and psoriasis of the scalp. However, it's important to control the psoriasis if you are losing hair as it is an inflammatory process.PRPHAIRMD.COM
The use of Finasteride(Propecia) should not have any effect on scalp psoriasis.However,I would recommend having an evaluation by a Dermatologist.
This requires an in-person evaluation. I suggest seeing a hair loss expert now to evaluate and go over your condition and, if necessary, provide you information about your best treatment options. There are great non-invasive options like prp/progesterone and/or hair transplantation. See an expert. Best, Dr. Emer
Psoriasis is an inflammatory scalp condition. It is not mediated to any significant degree by DHT. Neither using or not using finasteride should affect a person's psoriasis.
Reducing the dose to 1 mgs three times a week will still be effective, but slightly less that the same dose daily
20-30 is fairly low, but the 'normal' number can vary greatly depending on your hair length and hair density. In general you don't need to worry about how many are falling unless you can see/feel a difference with your scalp.
We are all born with different genes that dictate what we will look like. You certainly have lots of hair there