Chloemaree

Hey guys, Just came over to my mums house and saw my sister's bird and it has like these dry looking scaly lumps grown around its face. Also has very scaly feet too. I asked my younger sister why she hadn't noticed and taken it to the vet or at least googled something but she's very ditzy and only young but i'm still mad she didn't tell my mum. It seems quite healthy though he chirps a lot and plays with its toys and has been eating normal. It's hand tamed and about 6 months old just for reference too and apparently my sister said it's been getting worse over time about 2 months after she bought him. So can anyone possibly tell us what maybe wrong with it ? *Please no hate or anything, we want advice so we can literally help it ! Thanks:)