 [ Symptoms ] i left my birthcontrol microgestin in the blazing heat of my car for about four days are they still okayeffective [ Disease ] once you have cold sores herpes simplex you will have them forever and break outs may happen at any time often during times of stress illnesses minor trauma kissing  sexual activity etc even your menstrual cycle or sun exposure can trigger outbreaks you are not getting new infections each time you see your boyfriend but something may be triggering your immune system to allow this latent viruses to rear its head again finding that one trigger or triggers may not be possible to isolate