Hi for the last 3 weeks I have noticed a dark line appearing under my budgies beak. As he was eating and drinking normally I didn’t really take much notice and thought I would keep an eye on it. Well over the weekend I have noticed this has now developed into what looks like a boil or cyst. He’s an old boy around 9 years old now he belonged to late father. I’d be devastated if anything happened to him. Please can anyone advise what this could be please. I will schedule an appt with the vet asap.