Do New Hairs Grow as Miniaturized Hairs?
No, finasteride does not produce miniaturized hairs. It may cause new hair to grow or make miniaturized hairs thicker.
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How do you know this? Any evidence you can provide? Anecdotally on Reddit and hair forums – you read hundreds of posts of people “sprouting new mini hairs” (ie at the hairline), after starting finasteride, minoxidil, and more recently – dermarolling. These hairs may not necessarily be fully miniaturized – but they certainly are thinner than other terminal hairs.
How do you account for this?
I have seen patients with significant miniaturization placed on finasteride and then upon re-examining them, I saw less miniaturization as hair seem to become thicker in the same areas I examined.
William Rassman, M.D.