what the hell is a nug i keep hearin people say it but i dunno what it means. im good on most other words its just this one i got trouble with.
1 Improper use of contact lenses or steroid eyedrops can lead to fungal infections, which in turn can cause corneal ulcers. Also, a corneal injury that results in plant material getting into the eye can lead to fungal keratitis.  Acanthamoeba are microscopic, single-celled amoeba that can cause human infection.
Mouth ulcers can sometimes be caused by certain medical conditions, such as: 1  viral infections â including the cold sore virus, chickenpox, and hand, foot and mouth disease. 2  vitamin B12 or iron deficiency. 3  Crohn's disease â a long-term condition that causes inflammation of the lining of the digestive system.