For me chapped lips feel dry and flaky all over, while a fever blister usually starts as one tingly spot in the same place every time. Tracking where mine show up helped me spot the pattern.
Wind and sun exposure are big triggers for a lot of us, so a lip balm with SPF 30 has become part of my daily routine. It will not tell you what this bump is, but it is an easy habit either way.
Whenever I am unsure I keep the area clean, stay hydrated, and avoid picking at it, since guessing usually makes me stress more. If it is not settling down or you want a real answer, a quick check with your doctor or pharmacist is the way to go.
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