Should I be worried about this dark spot on spigot seal?

[mlfarrell]

Note the dark spot on the rubber stopper and also the white spot inside fermenter above it. White spot is same color as the trub layer. I’m just over a week into fermentation.

I should add that I tasted about an ounce of the beer just two days ago and it tasted pretty good, it was a little bit sour but I attributed that to yeast that was still in suspension since it’s so early.

 

[Dr_Jeff]

I don't get a sour taste from yeast.

 

[mlfarrell]

I don't get a sour taste from yeast.

Other posts on this forum say thats a common flavor of still-fermenting beer. It was 6 days in when I tried it.

I’m less worried about the “green” taste and more just wondering about that spot in the image. I fully sanitized the fermenter with iostar and ran quite a bit of san through the spigot itself and also sprayed the spigot whenever I took the sample, so I’m hoping that has been enough. I prob should have taken the spigot apart and cleaned those seals before I used it again, so that’s my only remaining concern.

 

[Dr_Jeff]

Its on the outside, so it really isn't a concern.