My daughter had a flat blister form about middle (outside) of her bottom lip. She nicked it with her fingernail and it scabbed. Another spot came up overnight slightly above the spot so it's more inner bottom lip, as well as one more on her upper lip where her lips meet. That spot turned yellow and started to scab by afternoon. They appear in shape to be cankor sores but are not directly in her mouth. She does not have history of cold sores, although she does have history of lip issues with peeling, cracking and splitting during winter and during high pollen allergy season. She just came off a dose of tamiflu and she takes plaquenil for an autoimmune connective tissue disease. She just flew out of state for vacation.