Is Hair the Same Thickness All Over the Scalp?

Hello, I have a couple of questions:

1. Is hair supposed to be the same thickness all over the head or are there zones in which thinner/thicker?
2. How important is shredding to the process of balding? I’ve heard from balding friends that they see a ton of hair in the pillow and specially in the shower or while they comb their hair. Does a substantial increase in shredding from your usual mean that you’re going bald?
3. I used an acne cream on my face when I was younger, I used it on my forehead and I noticed that my hair turned blond. Two years later I read the package and it said to avoid the hair. Do you think I could have lost the hair that turned blond or did it grow back eventually?

Thank you.

1. Hair is the same thickness all over the head except for that very frontal edge of the hairline, the temple prominences and the neck hair. That assumes that there is no miniaturization present.
2. Shedding is generally noticed when there is substantial miniaturization, which brings your attention to your hair. A good miniaturization study will show this one way or the other.
3. Acne creams have developed a bad rap. What did you use? When you know the answer, look it up on Google and see what it says about the cream and the side effects. There are a number of reports about isotretinoin (Accutane) causing hair loss. I couldn’t tell you why it bleached your hair though.