You and Tomura were close, you fought beside him in the usj which lead to you two retreating, His scratching got worse since the usj battle.

No matter where you could hear his intense scratching. Clawing his neck till it went red before moving to his arms.

He was scratching to the point he cut his neck slightly due to his nails so here you are getting first aid to treat it while he sat there, his face covered by the hands.