<prompt> A 7 yr patient came to opd with nodule on conjunctiva. He has history of taking TB treatment in the past. The nodule with has now encroached the limbus. What is the possible diagnosis.TrachomaVernal keratoconjunctivitsPhylectenular keratoconjunctivitisLimbus stem cell deficiency  <response>: The hints point towards phlyctenular keratoconjunctivitis Phlyctenular conjunctivitis Nodular response of conjunctival epithelium to endogenous antigen Organisms: TB, S. aureus mc, M. axenfield Age: 3-15 yr Girls Boys Predisposition in Low Socioeconomic status, Unhygenic surroundings Pathophysiology Stage of Nodule Formation Ulceration Granulation Healing Types : Conjunctival Involvement Simple Necrotizing Miliary Corneal Involvement Ulcerative: Sacrofulaceous Fascicular Miliary Diffuse infiltative Treatment Topical steroids Antibiotic ointment Atropine 1 in case of corneal involvement 