MacBook Pro Retina Display regular dim spots on the bottom

It has been a week and still, it's there no change.

Few times I have left my MacBook in my car and it has got heated. and dropped one time(But I have a protective case). One time dropped a little bit of red vine(like 4 months back). But this defect came after a few months later. My apple care expired 1 month back.

Device information:

MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports)

Processor 2.9 GHz Intel Core i5

Memory 8 GB 2133 MHz LPDDR3

Graphics Intel Iris Graphics 550 1536 MB

with. macOS Sierra 10.12.6

Power On Self-Test:

Last Run: 2/22/18, 10:10 AM

Result: Passed

Intel Iris Graphics 550:

Chipset Model: Intel Iris Graphics 550

Type: GPU

Bus: Built-In

VRAM (Dynamic, Max): 1536 MB

Vendor: Intel (0x8086)

Device ID: 0x1927

Revision ID: 0x000a

Metal: Supported

Displays:

Color LCD:

Display Type: Built-In Retina LCD

Resolution: 2560 x 1600 Retina

Pixel Depth: 32-Bit Color (ARGB8888)

Main Display: Yes

Mirror: Off

Online: Yes

Rotation: Supported

Automatically Adjust Brightness: Yes

Connection Type: DisplayPort