I have found that some spots, if not squeezed, take an age to disappear and then they come back from the dead.
I had one the other day that just wouldn't go. It of got a bit scabby but didn't get any less. I picked the stab off it, squeezed, and a hard bit of white came out. Problem solved.
AIBU to think most spots need to be squeezed until they run clear, and that it is the picking of the scab (of which I am guilty) that causes scars etc?