Hi @jyuthik,
Thank you for your question and welcome to the Bunnings Workshop community, it is fantastic to have you with us.
Is the patch of colour a scuff mark that could potentially be removed with something like this Mr Clean Eraser Pad Block or a cleaner such as Gumption Paste?
Or is it scratched paint that would need to be sanded and then repainted?
If it is scratched paint, I would suggest following the guidance in How To Paint a Door to repaint the entire door to ensure uniformity.
You can use Dulux 1Step Prep Primer, Sealer & Undercoat, followed by Dulux Super Enamel Paint High Gloss White paint to renew the door and return it to a high quality finish.
Let me know what you think and if you have further questions, please don't hesitate to ask.
Jacob
