Parrot losing hair on neck and chest area

[alizwarraich]

Hi y’all, I’m new to this community and just joined as I’m concerned about my ring neck parrot. She has lost a lot of hair around the neck and chest area such that her skin is clearly visible. I can also see some dark spots on her exposed skin but I don’t know what those are

Also, she has been with me since 20 months and I’ve seen some behavioural changes in her in the recent 6 months ever since I bought a male ring neck for her to play with. They stay in the same cage which is large enough for 2 parrots. The male parrot stays outside the cage for most of the time but the female comes out very less often. Before the male parrot, she would come out and play more often but now she doesn’t. They haven’t got along well even after being together for like 7 months. They’d still fight over the toys and food even when I have kept separate food trays for them

I’ll take her to the vet hospital next week which isn’t in my city but still I would appreciate if anybody can help. I’m attaching 2 of her current pictures