What does this symbol mean?

Okay I can't post a picture here so I'll just have to describe it. Under my listings for sale, one of the items has a little symbol where it would normally say how many messages I have. The symbol looks like a red apple with a black line drawn through it. I've never seen this symbol and I can't find any information on the app about what it means. Has anyone seen this symbol and do you know what it means?
Level 9
Is it possible that it is the profile photo of a user you have blocked or blocked you after sending a message? You wont see the message, but the asker's photo remains under it in a circle.