Looking at the pictures, I do think that this may go more for a prurigo papule or a viral wart than a pimple. It is difficult to tell with certainty from the picture what this lesion is.
I would suggest visiting your dermatologist to get this evaluated. If necessary, this can be removed and sent for histological testing. In the meantime, I would suggest to stop picking and scratching at the bump as this may worsen it.
