I know that you’ve addressed this before in a post a few years ago, where you suggested that exclamation mark hairs were a sign of a more serious infection. However, I was wondering if you could provide a little more information as to if it is also a sign of Is it a sign of traditional male pattern baldness?
Particularly if the thinning is very gradual down the hair shaft, only detectable if you bend the fallen hair so as to compare the top of the hair with the bottom next to the bulb.
If they get thinner towards the bulb and less heavily pigmented is this an example of the process of miniaturization? If not, rather than an underlying infection, could it be due to a lack of vitamins, or telogen effluvium?
If this smaller diameter is noticeable on all the hairs that are being lost, even from the side and back of the head, or even body hair is that the case where it is more likely to be as you originally suggested an underlying infection?
Hairs that look like exclamation marks can be a sign of a variety of issues, but alopecia areata is chiefly among them and often points to this diagnosis. Other possibilities include lupus, thyroid disorders, and some allergies. I don’t mean to get you alarmed, so see a doctor for an examination to get to the bottom of the problem.
I’ve written about this before — Is Hair Normally Thinner Towards the Root?.