As scars and small cracks can cause failures, it is recommended to replace the tires as soon as possible if this happens.
The main causes of scars:
Collide with obstacles and curbs on the road
Stone, sand, foreign body
Excessive flexion and extension due to insufficient tire pressure, etc.
Excessive tension due to high tire pressure
The main reasons for small cracks:
Excessive flexion and extension due to insufficient tire pressure, etc.
Local stress concentration due to scars, etc.
Aging due to ultraviolet radiation and heat
Excessive load due to climbing on road rocks