What is difference between blepharitis and conjunctivitis? Can one cause the other?

Eyelid vs eye. Blepharitis is inflammation of the eyelid. It is treated by gently scrubbing the eyelids with ocusoft wipes or with a q-tip and baby shampoo. There is bacteria and debris built up on the eyelid and eyelashes (rx antibiotic drops may help). Conjunctivitis is inflammation of the conjunctiva - layer covering the eye and the inside of the eyelids. Can be from virus, bacteria, allergy or chemical.
Yep. Bleph is of the lids. Conj is of the conjunctiva. They touch each other, so one typically spills onto the other.