Corrected sentence:
A bruise is a dark spot that appears after a bump. It happens when tiny blood vessels break and some blood leaks out under the skin.
Explanation for a 6-year-old (step by step):
- 1. You bump: You hit your skin on something.
- 2. Tiny blood tubes break: There are very small blood tubes under your skin called blood vessels. A bump can make a few of them break.
- 3. A little blood goes under the skin: When those tubes break, a little bit of blood spreads under the skin and makes a dark spot.
- 4. The color changes: The spot may look purple, blue, or green at first and then slowly gets lighter as it heals.
- 5. It gets better: Your body cleans up the blood and the skin goes back to normal in a few days or weeks.
When to tell an adult: If the bruise is very painful, gets very big, happens without a bump, or you have lots of bruises, tell a parent, teacher, or grown-up.
Grammar notes: I changed "BRUISE" (all caps) to "bruise" and wrote "tiny blood vessels" instead of "tiny vessels" to be clearer. The sentence grammar was otherwise fine.