Me too! I got some 4 years ago after changing the new lipstick (shishxxxx-maqxxxxxxx). I thought maybe this lipstick caused this. So I stopped using it. After giving birth to my 2bb last yr. More dots come! I don't know what are they! So scared! See 腸胃肝臟專科醫生or 皮膚科dr?
I have not consulted any doctor for this issue but I do believe it's indicating my health condition is not very good. In fact, I did not realize when it started but once I noticed it's already been on my lower lip and that big.
Besides, a Chinese doctor did mention 我體內毒素嚴重 when he looked at my lower lip some time before.
And once I did blood test the report showed 我胰臟的癌指數超標了。It's about 11 years ago but I did not sure whether the black dot had been showed on my lip or not at that time.
However, when something (especially black colored dots) appeared on your body, it should not a good sign that you better to do something.
Thus I take healthy food (like organic, use nature products (like 苦茶粉 to clean dish, diy soap for bathing nad sampooing ...) and lately my friend introduced me some supplements with evidents showed then I decided to make the trial and results looked satisfactory so far to me.