Deleting Salutation Field

Deleting Salutation Field

We have updated our lead input screen and 'Salutation' has appeared. This is not visible in the 'Edit Pgae Layout' screen so cannot be moved to 'List of Removed Fields' 
Salutation is visible in the list in 'Customization - Fields' however I can only 'Edit' or 'Replace' I cannot delete and I do not need this field on my lead input screen. 
Please can you advise how to get rid of this. 
Screen shots can be provided if needed. 

Thank you
Tasha