Molting chicken spot on skin

[LittleCountryFarm]

Hey! I’m a little new to this so sorry if this turns out weird. Anyway, one of our hens has been spending time inside because she decided to molt in the winter. Today when I was hanging out with her she was going through her feathers and I noticed a yellow-colored knob looking spot on her back. She seemed to find it itchy. Any thoughts on what this is or what I should do?
Here’s a picture:
(Sorry if it shows up blurry or something, again, I’m new to this)

 

[Kiki]

Preen gland.

 

[Kiki]

Welcome to BYC!

 

[DobieLover]

Hello and welcome to BYC! Glad you joined.
Where exactly is that located? Right above where the tail is!

 

[LittleCountryFarm]

Preen gland.

Okay thanks! That makes a lot of sense!

 

[Pork Pie]

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Best wishes

Pork Pie

 

[sourland]

Hello, and welcome to BYC.

 

[416bigbore]

Hello and welcome to BYC, You found an Awesome poultry Forum to be a part of with many great knowledgeable members who are more then willing to jump in and help you with any questions you may have.

 

[N F C]

Hello, thanks for joining us!

 

[Chick-N-Fun]

Welcome to our FUNomenal Community!

Best Wishes & Be Well!