Very light discoloration on the skin under your lower lip Can anyone advise you on what might have caused this?

Very light discoloration under the lower lip could be caused by various factors, including minor irritation from lip products, sun exposure, or even a slight allergic reaction. It might also be related to changes in blood circulation or pigmentation. If the discoloration persists or is accompanied by other symptoms, it's advisable to consult a dermatologist for a proper evaluation.