Abnormal growth of eyelashes towards cornea or conjunctiva is known as trichiasis. It could be due to some eye infection
like trachoma or herpes zoster
, severe drug reaction like Steven Johnson syndrome
, trauma to eyes, previous eye lid surgery or autoimmune disease
which scars eye mucosa like cicatricial pemphigoid
. Sometimes it could be present since birth. There is another condition known as distichiasis where an abnormal row of eye lashes might grow and harm cornea.
The treatment involves removing the in growing eye lashes.
However, it is beyond my understanding how would biopsy of scar tissue help in treating the condition. When he said it could affect other mucosa he probably was thinking about pemphigoid.
I would advise you to consult an expert eye doctor to evaluate your concern.
Hope that answers your query,