Cold sores are the visible signs of Herpes simplex 1,
Herpes is clinically defined as an STI/STD, JUST like HIV, but not everyone with hiv got it sexually. Some were born with it, some got it from infected needle neither of which ever have had to have sex, just like Herpes but it is still an STD.
If you have cold sores and have never shared utensils etc. or been kissed by someone with an outbreak (sometimes you can't see it) it's pretty simple, your mom and possibly your dad as well have Herpes simplex 1 or 11 or both, (simplex 11 is in the nether region)
Clinical studies show that Herpes passes from mother to child mostly when she has any slight outbreak down there and when the baby comes into contact with it, it passes on to him/her(even if your mom has never had an outbreak-to your knowledge). Asymptomatic Shedding!
So yes you and one or both of your parents do have an STD .it's called herpes.
But not to worry.
Though it cannot be cured, there are many things that can be done to decrease the number of outbreaks you have.
In addition to meds, lower your sugar intake, decrease stress, take extra precaution in the winter period (cold brings cold sores), girls during their periods their immune system goes down so they are also prone to it around that time.
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All the best.
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She whispers in the greyest of grey voice. "hush my child, hear now this is the antithesis of the end".