Pls help 😭♥️

I’ve just healed my arms which is wonderful! I truly have not scratched my arms at all the past few days, they’ve had no contact with my hands yet when I looked down at the end of the day just now my eczema has started to flare up? Does anyone know why or how to prevent it? I didn’t even think you could just develop a rash without scratching https://imgur.com/a/jDz5wgF