Don't worry
Hypertrophic scar is common in dark skinned individuals ,due to various reasons and is not something to be scared
It's due to excess deposited skin healing tissue..in your words excess bricks for enough wall
Next Steps
Consult General surgeon..
Upon increasing this to keloid..next phase intrapersonal steroids are advised..
excision may be done if discomfort is more and increased size and thickness
Health Tips
Do not scratch with nails or put unsterile things over the lesion..
Use local emollient like calosoft lotion for local itching sensation..however actual cause to be treated for permanent clearance of problem