blepharitis

This term is a clinical medical diagnosis used primarily in ophthalmology and dermatology. It describes a specific inflammatory condition of the eyelid margins and is characterized by a sterile, technical tone. In a clinical setting, it is often distinguished from other eyelid conditions by the presence of scaling or "crusting" at the base of the eyelashes.

As a medical condition denoting a specific disease state, the word is uncountable. It refers to the condition itself rather than individual instances of the disease, meaning it does not take a plural form in standard medical discourse.