My budgie has a lump under his wing
The lump developed a couple of weeks ago, it looks more like a large blister. The lump is soft and seems to be filled with fluid. My budgie is eating and drinking and behaving normally and doesn't seem to be affected. His wing now sits proud of his body, it does not appear to be sore or hurting. I can touch the lump and move his wing and it doesn't seem to hurt him. The feathers over the lump have fallen out (I don't know if he did this himself). It seems more like a cyst, should I drain this or does he need to visit the vet?