Hello, I have gone through your query and understand your concern. This is most likely to be a bacterial ulcer or it could be a foreign body which is embedded into the surface of the eye focus on the cornea which appears to be on the iris due to juxtaposition. Changes in the iris are rare and usually accompanied by major internal eye issues such as inflammation or trauma. That would definitely cause eye irritation and redness. Please avoid wearing contact lens till you consult ophthalmologist. As wearing contact lens may worsen the ulcer. You should consult Ophthalmologist. Because he will examine and confirm whether it is a ulcer or foreign body and start appropriate treatment. If it is a foreign body, he will remove and start antibiotic and steroid drops to prevent infection and further damage to cornea. Hope this helps. Please write back for further queries. Wishing you good health.