Need help

https://drive.google.com/file/d/129tRHQEH9ejnGH1DbKWwsIMpo\_\_paGuG/view?usp=drivesdk

Age-23

Gender-M

Height-5'5

Weight-79kg

Not a smoker

This appeared suddenly on my right arm. I didn't even notice it at first since there was no pain or itchyness. Can someone tell me what is this? Do I need to see doctor