Why does my galaxy a15 have a few blue spots on my screen. I do not know whether if its created by ink or not. Also I tried cleaning with wipes, but I didn't work.
Sorry to hear about your issue.. Have you dropped your phone or did you get any water inside device? From looks of it it seems like you need screen replacement these blue discolouration happens due to impact (let's say if you drop your phone), liquid damage, or a pressure if you sat on the phone.
I would strongly suggest to contact Samsung’s customer services so they can book a repair or an inspection, or visit Samsung’s experience store if its close to you and let them inspect the phone.