Lighthouse sign is seen in ASOM in which stage
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)
Stage of suppuration
Stage of hyperemia
Stage of resolution
Stage of presuppuration
Ear