I normally thread my upper lip hair and had not had this issue with the skin darkening from it. There were a couple of tines I used tweezers and since it was summer I suspect thag light have been what caused the darker marks. What do you suggest to help fade them? Routine below.
Yes, probably the tweezer caused a small skin trauma, and together with sun light, it lead to a pigmentation mark. Sunscreen is the most important thig to help it fade. In addition, I'd change your moisturizer to something with 2-5% niacinamide (for example, https://whatsinmyjar.com/product/dermageek-nourishing-facial-night-cream).
Directly on the spot, you can use this spot pigmentation treatment: https://whatsinmyjar.com/product/eucerin-anti-pigment-spot-corrector