Hello! Can you tell me what this might be? The girl is 18 years old. S…

Hello! Can you tell me what this might be? The girl is 18 years old. She will go to the clinic tomorrow, but she doesn't know if she will get in because she lives in another city (she's a student). She can't find which clinic she is registered with. She has been eating normal foods as always, nothing extra, nothing exotic. She has itching, sometimes even at night, on her legs, arm, and face.