Question for Fin and Niz users

[NYK155]

This may seem a bit odd but was curious if anyone else has had a similar experience and what steps you took to resolve...

Been on fin for 6 months, and have been on Niz (regenepure dr) for over a year. When I first started Niz I was getting a horrible MPB itch. Since starting fin and Niz it has completely gone away. However, in the past month or so I've been getting a burning, sensitive to touch area on one side of my head. It's not as constant as the MPB itch was and I have noticed it's worse when I use the Niz. I"ve been trying to stay away from Niz to see if it's just a reaction but it's still coming and going.

I've tried to add moisturizing shampoo, and conditioner but it's still there. I think my hair is thinner on that side as well.

Any insight would be greatly appreciated!