Tonsillitis or quinsy? How can I tell?

[Toasticles]

Just collected Ds age 19 from uni.
He has had a mild sore throat for a few days but overnight became very bad on the right side.

He has been to the walk in centre at his uni town and been diagnosed with tonsillitis by a nurse practitioner. He has been given 10 days of penicillin. He's only had the first dose. However I am panicking and wondering if he has quinsy due to the history, his age, and it being mostly one sided.

He is limiting drinking and swallowing his spit, because it hurts so much, but he can do both.
His pulse seems ok and he's not feverish as far as I can tell.

I need talking down from taking him for a second opinion. I have limited faith in first opinions due to my personal history. Attaching not great pic, the problem tonsil is his right, left of attached pic.

Quinseys are beyond belief horrible and worse than tonsillitis. He was seen in person, give the drugs a chance to work and try not to fret.

There isn't a quinsy there on that photo.

Things to look out for re quinsy:
The uvula would be pushed away from the side with the quinsy.
The swelling in the photo there is tonsil, quinsy is swelling of the tissue next to the tonsil and looks different.
The difficulty in swallowing is due to swelling not usually the pain with quinsy
Quinsy can cause trismus which is where you can open your mouth properly - given how well he can open his mouth on this picture he does not have trismus!
The voice can change with quinsy - classically got potato - it's sounds as though your mouth is full of food.

Make sure he takes the antibiotics and regular pain relief - full doses of paracetamol and ibuprofen for the next few days. You can buy difflam spray which also helps. Make sure he keeps hydrated even though he won't want to - ice lollies are good!

It often takes 48-72hr of abx until you start feeling better so symptom control with the above is important.

Hope he feels better soon

Thank you both very much. Really helpful.