This is catfacing right? Please help!

[raindrops27]

I noticed this the other day. I have no idea as to what variety. As most I grew from a mixed bag of rainbow seeds. I think it looks disgusting. The whole tomato including the spot is, rock hard. So, is this catfacing, and if I leave this on the plant will it affect other fruits, which have not set yet? Also, does diseased fruit take more energy to grow. In other words, am I doing more harm to the unset fruit, by having it on there. Thank you so very much in advance, for the help..