Chicken Pox Blood In Stool Is This Normal???(soz If TMI)?

Is this normal???(soz if TMI)? - chicken pox blood in stool

My son is almost 2.I a bit under the weather quite cold mo.Has just took the chicken pox.He tomorrow.This Documents morning I was changing diapers, was fouled up and pull, but I am not sure whther Green their chairs were normal.They were very dark, almost black.There not appear at all seemed to be no blood or nothing and lose werent, but he never had a coat like this before. He has his teeth a little bit this month, but the chairs are usually green when teething.Im confused.Anyone some experience with their children or know what cause this discoloration. (Diet has not changed dramatically o) Thanks in advance:)