This happened to my mine too, its definitely just the anti glare cover. It's going to happen over time when drawing consistently in the same spots. The second pic is just the protective film coming off, you can buy a new one amazon.

https://www.amazon.com/dp/B08B5S9DWB/ref=cm_sw_r_cp_apa_fabc_D1E4FY6QPPCTFR7996TH