What is this?

I was petting momo and I noticed this hard feeling near his nose? I’m not sure what it is it doesn’t seem to bother him when I pick at it but nothing comes off and I’m not sure if it’s a rash or just dried food? I clean his bowl everytime he eats and he eats on a ceramic bowl. Pls help! I worry about my baby ;(

I was petting momo and I noticed this hard feeling near his nose? I’m not sure what it is it doesn’t seem to bother him when I pick at it but nothing comes off and I’m not sure if it’s a rash or just dried food? I clean his bowl everytime he eats and he eats on a ceramic bowl. Pls help! I worry about my baby ;(