i also wanted to tell you that coffee, chewing gum (sugarfree and Sugar type) cough drops (filled w/ Sugar and/or chemicals) soda diet or regular and any type of Sugar product all aggravate this condition. My heatlh food store specialist advised me to rinse my mouth with tree tea mouth rinse and to take olive leaf capsules...give it a month to correct itsself and take care to not fall into harmful oral care habits. i think the stress of a cleanse and also your body expelling waste and toxins would be a perfect trigger for lichen planus...DO NOT PEEL THE WHITE STUFF from your mouth or sores and pain will result.
drink LOTS of water. actually while having this i seemed addicted to water..i had to have it constantly. i know i am going on and on about this but it is really a very horrible condition to have and i guess you would only understand this if you were the one having it. i feel really bad for your mom. if it gets bad she needs to go to the dentist (do not let them do a biopsy) and request the lichen planus mouth rinse. if they suggest a biopsy tell her to insist she try the rinse first then she will get back to them. it is weird how many things there are out there to get. how annoying is that!!