Phlyctenous conjunctivitis or phlyctenulosis is a disease that causes inflammation of the conjunctiva or mucous membrane of the eye, which leads to increased sensitivity, itching, irritation and pain in the eyes. This medical condition can be caused by various reasons such as an allergic reaction, viral infection, bacterial contamination or contact allergy. Phlyctiniulous conjunctivitis can also occur after contact with various chemicals, such as preservatives, paint or cosmetic components, medications, contact lens care products, etc. Conjunctival conjunctivitis begins with irritation of the eye structures, which appear as red spots on the eyelids. Then an inflammatory process appears on the conjunctiva in the form of dense white bubbles ranging in size from a few millimeters to about a centimeter, and each bubble is called a “flictula” (from the Latin “flaagella” - bubble). Towards the very end and the second day of the disease, pinkish-red bleeding blisters appear under the follicles - phlyctena. The patient’s well-being worsens due to the presence of burning, pain and stinging in the affected areas. The incubation period begins within 24 hours - from 4 to 24 hours after the action of the provoking factor, and usually lasts a week. There are several types of conjunctivitis: superficial (catarrhal) and deep, it is also classified according to the prevalence of the disease: - ophthalmogenic (during the patient’s illness, the mucous membrane of the eye is predominantly affected), - retinal (acute and chronic processes in children in which inflammation does not spread on the cornea and retina), - subconjunctival (can be dangerous by disrupting the functionality of the lens, cornea and lacrimal gland).