Girls, hello! What could it be and how to treat it? ? It's been bother…

Girls, hello! What could it be and how to treat it? ? It's been bothering me for about a month, we smeared Advantan and everything went away, but it reappeared again (they say you can't smear Advantan too much (there's still wet on it)). He scratches his ear when he gets nervous or when he's overexcited, is that because of this?