Hen with swollen rear

[The Golden Egg5]

When I was checking everyone out on the earlier today, I noticed one of my favorite girls, nugget, had a very swollen bottom. I don’t know what it could be! I know she layed an egg yesterday because I got 19 LF eggs and I have 19 laying LF girls. None of the eggs were different than normal. I can get some worm tests done, as I have never tested/treated worms in the past.
She is about a year and a month old.
I snapped a picture of her vent and maybe y’all can see something strange about it that I can’t. The swollen area is below the vent. It is kinda soft and feels bloated and kinda hot-but that might have just been because chickens are naturally warm.

If it’s important, she is a buff Orpington
ETA:
Forgot to say
She seemed to be acting normal. I didn’t notice anything off about how she was acting. The only odd thing was that her bottom was swollen. Like below the pelvic bones and then between the legs the swelling tapered off.
I really hope it’s nothing serious!

 

[ChickNanny13]

It's normal looking to me, a "laying" girls bum

 

[The Golden Egg5]

It's normal looking to me, a "laying" girls bum

That’s good!

 

[The Golden Egg5]

Here is a photo of what I’m talking about. She’s super fluffy so it’s hard to see, but my hand is on the part that feels swollen. It feels kinda like a small watermelon.
All the other girls don’t have that. But she is the biggest girl, so maybe that’s it?
I’m fairly sure she laid an egg but it’s hard to be sure with 34 chickens

 

[ChickNanny13]

Oh thought you meant the VENT was swollen ... You're meaning her underside?
Is it hard? Squishy? I'm "new" to Emergencies/Disease/Injuries and Cures so lets get the experienced Thank you ALL in advance for your help

@Wyorp Rock @aart @casportpony @WVduckchick

 

[casportpony]

Some hens are fatter than other, but some get something called ascites. Not much can be done if it's ascites, so as long as she's acting normal, don't worry too much.

What do you feed them? Lots of scratch isn't good for them, so don't feed too much of that.

 

[The Golden Egg5]

I feed them 18% chick feed and they get the occasional fruit or veggie scrap.
Thank you for the help! She is my baby and I hope it’s nothing.

 

[The Golden Egg5]

Could worms be the cause?

And also, it is normal squishiness. It isn’t super soft, but not hard either.

 

[Eggcessive]

I have seen it in some hens. If they are laying normal eggs, I would watch them. Some may stop laying, lay abnormal eggs or soft eggs, some may have a broken egg inside. Ascites or water belly is one of many causes for an enlargement in the lower belly. Impacted oviduct, internal laying, egg yolk peritonitis are some of the many laying disorders. She also couldy just be fat. Some of my hens had red lower bellys, bare of feathers, who lived several more years. I would just keep track of her laying if you are around to see her in the nest box.

 

[ChickNanny13]

Thank you Eggcessive, I couldn't think of the ailment (ascites) read about it but couldn't recall the term Thank you for your input