Trichiasis develops most commonly some time after chronic blepharitis Blepharitis Blepharitis is inflammation of the edges of the eyelids, possibly with thickening scales, crusts, shallow ulcers, or redness and swelling at the edges of the eyelids. The inflammation is caused... read more (inflammation of the edges of the eyelids) or injury or damage to the eyelid or conjunctiva. Some people are born with an extra eyelid skinfold (epiblepharon) that causes the eyelashes to grow straight up into the eye or with an extra row of eyelashes (distichiasis).
Trichiasis differs from entropion Entropion and Ectropion Entropion is a condition in which the eyelid is turned inward (inverted), causing the eyelashes to rub against the eyeball. Ectropion is a condition in which the eyelid is turned outward (everted)... read more (a condition in which the eyelid is turned inward) in that the eyelid position is normal.
In people with trichiasis, an eye doctor can remove the eyelashes with forceps. If eyelashes grow back, other methods can be used to remove them, such as electrolysis (use of heat and electrical current to destroy the hair follicle) or cryosurgery (use of extreme cold to destroy the hair follicle).