I have eczema on just on finger. i also work in water and bleach, so what can i do to help prevent it from being worse?

Keep it dry: Look for strategies to keep it dry-- wear gloves or a waterproof dressing. Minimize time in water. Dry after exposure thoroughly, etc. If needed, consider a change of work assignment.

Eczema: Unfortunately your job duties do not help with your issue… Try to keep your skin from drying out, which the repetitive use of water and bleach will do, maybe try to wear gloves at work and use lotion throughout the day on your hands to keep moisturized.