Schwartze sign is seen in-

In Otosclerosis on Otoscopy Tympanic membrane is normal in appearance mostly, middle ear space is well pneumatized and malleus moves with pneumatic otoscopy (i.e. mobility is normal) Sometimes a reddish hue / Flammingo-pink may be seen on the promontory and oval window niche owing to the prominent vascularity associated with an otospongiotic focus. This is known as Schwartz sign.