<prompt> Lighthouse sign is seen in ASOM in which stageStage of suppurationStage of hyperemiaStage of resolutionStage of presuppuration  <response>: Lighthouse sign: It means flowing out of discharge from the perforation in the tympanic membrane. The external auditory canal may obtain blood tinged discharge which later becomes mucopurulent. Usually, a small perforation is seen in anteroinferior quadrant of pars tensa. Hyperaemia of the tympanic membrane begins to subside with a return to normal colour and landmarks. Ref: Textbook of diseases of ENT, PL Dhingra 7th edition, pg no. 68 