The evaluation of infectious blepharitis begins with a medical history and eye examination.

Physical findings of infectious blepharitis may include:

• Swelling and redness of the eyelid edges
• Scaly eyelids
• Thick coating on the lids
• Ulcers at the base of the eyelashes
• Misdirection of eyelashes
• Scarring of the lid margins
• A painless, swollen lump in the eyelid
• Conjunctivitis:
• Irritation and swelling of the thin, clear lining on the eye

The diagnosis of infectious blepharitis does not require testing.