Pimple most likely: From the description this sounds more like a pimple as it built up over time and came to a whitehead before it drained. Cold sores are usually more flat and shallow, moist looking and sting quite a bit. Either way, touch it up with a little Neosporin and avoid sharing kisses with anyone until it heals. See your MD to confirm the diagnosis.
Answered 1/4/2016
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