Do you recall what the product was that you used? Is it still in existence to look up the ingredients?
Did you consult good dermatologist?

@Forever_Free No. I don’t know. No.

And some people say that no one ever says anything new!

You put weight gain powder in your hair to look like a DROW ELF?

What possessed you to do that? Oh, it’s white. Did this work at all? Didn’t it look like you dumped white powder in your hair, which then kept falling out all over everything?

And, THAT WAS TWENTY-TWO YEARS AGO! And your scalp has been itchy and scabby ever since… and now you’re asking about it?

How soon after you did this, did the itching begin? Do you itch it to the point it bleeds and scabs, or have you even relented in itching it long enough for it to heal and stop itching?

And of course, have you seen a dermatologist? What did they say?

I tend to think no, I don’t think that would cause that, but if it was tightly linked in time, and then you kept itching at it, maybe it did start something that’s still going on. After a week or so, I’d think any direct cause would be over, though, and you’ve been in a cycle of some sort for the last 22 years… I really hope you’ve asked medical professionals about it long, long ago. After all, it’s not like you live in the USA.

@Zaku The OP does not live in the USA.

@Zaku Yes. It didn’t work. Yes. One day. Yes and it didn’t help. No.

I suggest the powder has nothing at all to do with the scalp issue. You must ask your doctor for a referral to a dermatologist.
I had a bad reaction to a shampoo a few years back and all my hair fell out. It took about a year for it to grow back in healthy as before.

Before I answered, i looked at the ingredients of several weight gain powders on the market today. The problem is that there is no common factor to what goes into their powders—additives, ingredients, or whatever. They are all over the place.

So 22 years later, it is impossible to even guess what might have been in a package that you used. As someone else said, a dermatologist is your best bet.

There is an important lesson here.

You have dandruff. Try a good anti-dandruff shampoo, like Head and Shoulders.

@RedDeerGuy1 Huh, well since it started the day after, it does sound like you irritated your scalp. Was that the only thing you put in your hair that day? In any case, with allergies, what can happen is a strong exposure can train your immune system to react to something as if it’s a pathogen. I think too if you are scratching, that can cause a vicious circle. I would try a dermatologist and/or allergy specialist and/or naturopath, and do whatever I could to avoid scratching it.

@Hawaii_Jake I know. That’s why he’s Red Deer Guy – he’s from Red Deer, in Canada. I wrote, “After all, it’s not like you live in the USA.” as a sad joke about how people in the USA sometimes choose to avoid seeking help for a chronic health issue for decades, because they’re more concerned with the cost of health care in the USA. Which isn’t the case for RDG.