please I need help how do I get rid of this thing on my head.

Go see a dermatologist

Check my signature for cheap flight bookings this festive period

use damatol morning and evening for like 2-4 months, it will kill it. assuming its not too big like this, Damatol can kill it in 1 week. Make sure you take your bath before rubbing damatol on it. Dirtiness enhances its growth. Damatol is just #350 or less.

or visit a dermatologist like the guy above said.