Conversation: The conversation between human and AI assistant.
[|Human|] My father is 91 and just told he has herpes. He has a nickle-sized black, crusty appearance spot on his upper lip. It does not resemble ANY herpes pics I ve seen. The one spot is all there is, he has had it aprox a week before his diagnosis. Other than raising (aprox 1/8 ) it has not changed much. It is sore to touch but does not itch or cause much pain besides. What else could it be? Where might I find other pics of other possible causes?
[|AI|]  Hi, Welcome to Chat Doctor. The description in your query closely matches that of herpes labials which is caused by herpes simplex virus. This infection presents with grouped blisters fluid filled near the mouth and nose. The blisters break, crust and then heal without scarring after 7-10 days. Other causes of rash near mouth could be colitis caused by vitamin deficiencies. I suggest you apply acyclovir cream over the rash 4 times daily for faster healing. Thanks.