I don't see anything except perhaps a faint light outline at the bottom of the cere as the picture is a bit out of focus. Could be just dry or maybe the beginning of a case of mites, do you have an avian vet?
Thumbnail pictures are often not able to be opened by other members.
Of the three pictures you posted, I was only able to expand the third one you posted.
I've saved it and lightened the shadows so others can more easily see the budgie's cere.
However, I'd like to ask you to provide additional clarification as well:
How long have you had this budgie?
Was the picture taken with flash?
Is the area around the nares different than when you first got the bird?
What color overall was the cere previously?
Is the coloration under the nares a deep royal blue or is that area starting to turn brown?
Please take the time to read through the Site Guidelines, all of the How To Guides, the FAQs, the Budgie Articles and the stickies located at the top of each section of the forum.
Truly, the very BEST advice anyone can offer you is to take the time to read ALL of the stickies throughout the various Talk Budgie forums as well as the Budgie Articles we have posted.
These are great resources for Talk Budgie members and have a wealth of reliable information which will assist you to learn the best practices in caring for your budgies for their optimal health and well-being.
Your budgie is a very handsome boy He's not female, the reason there's some lighter areas around his cere is because he's not currently in condition and therefore the blue is lighter than normal around the edges.
Meanwhile, be sure to read through the links provided above as they are filled with the very best practices for caring for budgies. If you have any questions after reading through the forums' many articles and stickies, be sure to ask!
We look forward to seeing more of your budgie soon!