What kind of comb is this?

[Hopeful homesteader]

I have a silver laced wyandotte whose comb is completely smoothe with a indented circle at the top. Neve seen anything like it before and not finding anything online about defects.

 

[ChickNanny13]

Almost looks like a "cushion"
https://backyardpoultry.iamcountryside.com/feed-health/types-of-chicken-combs/
https://cs-tf.com/chicken-comb/