Yeah just swollen calyx. Nothing to panic about.
This is controversial, so take it as you will....
Light leaks ain't that big of a thing. They get blamed for most cases of herm when in actuality the reasons are either heat, other stress or purely genetic. They may contribute but get blamed when not really a massive issue.
I had a oil radiator with a red led on on my tent for weeks. Guess what...? No herms.