Bump on c-section scar

Arlin
Hi! Anyone have any idea what this is? I just discovered it today, when I pull at the skin, this little bump appears at the end of the scar. When I'm not pulling I can feel something hard but I can't grab it or anything. I'm 7 weeks PP. it doesn't hurt and I haven't had any fever, and it wasn't there last week at my 6 w PP appointment. 

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