Everyone in class 1-A was chatting normally, until Izuku came into the bathroom and started screaming and crying in horror. Once the others came into the bathroom, they saw a bleeding Tsuyu. Apparently, she had touched the wild parsnips (which she is allergic to), and since she itched so much, she started to make her skin bleed a lot

Ochako: Tsu! Why are you itching so much?!

Tsuyu: But they ITCH!

Bakugo: Tch. You’re bleeding.

Izuku: is very traumatized