As a rule, does miniaturization need to be present behind the frontal hair line to indicate genetic hair loss? What would you say to someone who presented you with an intact, albeit mature, hair line – with no thinning present behind but had noticeable vellus hairs along frontal edge particularly in the corners where the hair line had raised a little bit with age? These “straggler” vellus hairs look to be the remnants of a retreating hair line – from juvenile to mature – but its hard to tell and self-diagnosis is uncertain at best.
(33year old caucasian male, no significant family history of early hair loss)
On occasion, I have seen some men lose hair without going through miniaturization. This is more common in the process of developing a mature hairline, but anything is possible. At times, some vellus hairs remain in the frontal area where the juvenile hairline formerly was.
I have heard from a small number of patients who describe what you are going though with the less body hair growth, but after a few years of Propecia use. At least your scalp hair loss has subsided… and who could be upset about less back hair, right? Regardless, it doesn’t indicate any future regrowth or thickening, but may be one of those rare side effects. 
Sorry about that. I thought it was pretty clear. In the post you’re referencing, I said the “Norwood chart is not to be seen as a progression of hair loss chart, but rather the final patterns seen in a large male population.” Here’s what I meant…
We typically lose 100 scalp hairs each day… and most of that loss may occur when you are outside with the wind blowing through your hair doing your everyday activities. We are born with approximately 100,000 hairs on our scalp. While you may be losing 100 scalp hairs a day, your body is also growing 100 scalp hairs that you cannot see to keep things on a balance.
You are very observant. These color changes in the scalp reflect sun damage, and one way to protect your skin is by using a good SPF sunscreen when you’re outdoors. It is unrelated to hair loss, but it makes sense that you’d notice these spots in an area of the scalp where there isn’t hair (like your frontal hairline).
Propecia (finasteride) might be a possibility, but without seeing you I can’t make that recommendation. It’s a prescription medication and one of the two hair loss medications approved by the FDA. You’re not guaranteed to regrow your hairline with Propecia, but hopefully it could slow the loss. The earlier you start the medication into your hair loss process, the better.
Thanks