why is a black lining forming inside my cats mouth? HELP?

B

bananapple

New member
I have a american short hair tabby and he is about 4 and a half. His pink lips are starting to have a thick black lining. Should I be worried? This photo was taken a year back,

http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs1156.snc4/149877_143336592384735_100001251844887_254912_899854_n.jpg
 
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