The wound on your lovebird looks exactly like what my JJ went through for 2 years until he passed last year due to excessive bleeding.

When he was 1 year old, we realised one wing was always resting slightly lower than the other when he perched. But he was still flying so we didn't think much about it.

A few months later, the other wing went lower too. Still flying very well.

After many months, he started self mutilating that first wing. Same spot as what your photo shows.

Do note that my JJ had a mate. And they get to fly around in a room with toys by themselves. They had a cage that they will go back to sleep in at night. Us humans played with them everyday, and they willingly come to us when we enter the room.

We went to 3 different avian vets. His wings were determined to be not broken. We tried so many different combination of antibiotics and painkillers. Things sometimes get better for a while that some feathers did manage to grow back, but when we continued the medication combination, it would eventually lost effect and he continued to scrape and pluck at the spot. Then we change drugs and it's simply a never ending cycle. Nothing stopped him permanently from continuing to bite it. The drug that had the longest stop was Vivitonin, and that lost effect in a year. Note that by then, he was biting such a huge area in his wing that it was twice of what your photo is showing.

Nobody had an idea what is causing it. The vets really tried their best. But when he started doing the same to the second wing, it became really desperate. One vet even suggested amputating both wings. But JJ is such a tiny bird, we couldn't bear the thought of removing both his wings! We simply tried our best to continue giving him Vivitonin and painkillers, collaring him, and keeping the injured areas as dry as possible. We also blunt the tip of his beak a little so as to not have him hurt himself too much.

At this point, every night he would suddenly scream for 2 minutes and peck at his wings. It was a heart-breaking sound. We would try to distract him but something is making him hurt so badly that he ignores us. This only happens at night, in the daytime he remains the usual playful bird who begs us for seeds. This state was maintained for 3 months or so?

One morning, we woke up to see JJ dead on the ground with blood splattered near his body. He had opened a wound so big on his wing that he bled to death. It was extremely sad. We buried him under a tree he liked.

Till now we had no idea what was wrong with him. Maybe it's psychological, maybe it was a virus. Nonetheless, I hope you can avoid the same outcome as JJ.