"watching a waiting" is the worst thing for someone with HA to hear, I think, it sets off all sorts of brain weasels
Normally I'd suggest limiting any checking (in this case looking at your lip) but this seems complicated by, oh, I dunno, the existence of mirrors?!
I really feel for you...
I think the best way forward is to remind yourself that it's not especially likely that this new tiny mole IS anything to worry about; that even if it were, it's really likely entirely curable because it's currently very, very tiny.
And, if it's any consolation, I have an exactly identical mark, acquired in adulthood, and it's done nothing since it appeared.
(I will now resist the urge to go look at it in a mirror to confirm this...)
Best wishes to you, truly. But I think you're going to be just fine.