18month old platelets @2000 has ITP

Omg I can't even began to tell you all how hysterical I was two nights ago when my sons pediatrician called and said "get to the ER NOW" I could have died

My son has petechaie al over his neck and chest (this is what alarmed us) his tongue was covers with red dots and his cheeks had blisters yet the docs did not treat and sent us home. Two days later (today) his moth had totally healed but the petechiae is still lingering. My mother inlaw suggested I give my son polyvisol and a multi vitamin so I did now my son mouth is back with a blue blister on his tongue my husband thinks it's the pacifier but I think it was the vitamins

Question for parents whom kids are still attached to the pacifier, does the pacifier causes bruising and redness in the mouth?