Maybe it's a hot sore. I've had it before, and it grows most easily when I get angry. I'll put some ointment and erythromycin on it to prevent bacterial infection.

Drink more Xiasangju, relax, and add some Niuhuang Jiedu pills or Andrographis paniculata, which will have a better effect. If the landlord usually pays more attention to the rules of diet and life, getting angry will naturally leave you. I hope my experience can be useful to you, and I wish you a speedy recovery. O(∩_∩)O