As an STD assistant, I understand your concern about the potential outbreak under your nose. Herpes simplex virus type 1 (HSV-1) is commonly associated with oral herpes and can cause cold sores or blisters around the mouth and nose area, especially when the immune system is weakened, such as during a cold. However, it's essential to have any new or concerning symptoms evaluated by a healthcare professional to determine the cause accurately. I encourage you to make an appointment with your doctor or a sexual health clinic for proper diagnosis and treatment recommendations. They can examine the area, run tests if needed, and provide guidance on managing any outbreaks or transmission risks. Please don't hesitate to seek medical advice for your well-being.