Hey there, roshini208.
Welcome to the Apple Support Communities! Thanks for posting about the light you see in the lower left of your Mac display after a drop. We'd be glad to see what we can do to help you out.
Based on what you mentioned and the photo you provided, it's hard to say whether the light bleeding visible in the image will increase or change over time. With the Mac being dropped, it might not be a bad idea to have it inspected by a technician to ensure that there is no other damage present. More info on that can be found in Mac Service and Repair. You can also Get Support with this directly from Apple here.
Take care.