My Daughter Has A Very Sensitive Skin N Any Minor

My daughter has a very sensitive skin n any minor scratch turns into permanent mark of a two shade dark tone than her own skin .now recently she has suffered with three to four scratches again by her cousin they r in the healing process n have developed a hard brown coating but I fear of their turning into permanent scars after the natural healing coat falls.please help me avoid these permanent scar formation. thanks n God bless u.