Abrasions
Abrasions (where only the surface layer of skin is cut or scraped off) may bleed and feel slightly painful, but the affected area will normally scab over and heal quickly. The wound is caused by superficial damage to the skin, no deeper than the epidermis. Abrasion injuries most commonly occur when exposed skin comes into moving contact with a rough surface, causing a grinding or rubbing away of the upper layers of the epidermis.