My parakeet/budgie has a hole right under it's beak

by Marlen
(California)

I was feeding my parakeet spray millet and I put it a little bit up, when I saw a hole. I've had my parakeet for 5 days now. I want to know if this is because of loss of feathers or if he needs any urgent medical attention.
When he's in his regualr position he looks normal, he eats normaly, he drinks normaly, plays around, he's a very lovable parakeet, but I'm really worried about that hole.