What are these brown circles on my lemons?

[DuboceGardener]

Hello. My lemons are getting one brown circle on the top of the lemon. Does anyone know what this is? I have attached a picture. Thank you for your help!

Brown circle on lemon

[JONA]

That looks like Citrus Brown Rot DG.
Best controlled by getting good air movement through your tree. Remove damaged fruit from the area.
If the problem is very bad then fungicide sprays may be needed.

[DuboceGardener]

Thank you very much! I really appreciate it.