Cold sores do not contain white heads like pimples do.
Pimples that have white heads are caused by clogged pores in your skin while cold sores are caused by a viral infection called the herpes simplex virus and are contagious but pimples are not contagious.
When you have a cold sore you should avoid kissing someone.
You can apply Apple Cider Vinegar or even Toothpaste to the cold sore to get rid of it.