Dermatographia, which is sometimes called “skin writing,” refers to a condition in which seemingly minor scratches turn into temporary but significant reactions. This condition is also called dermographism or dermatographic urticaria. Approximately 5 percent of people have this condition, and it’s most common in older children and younger adults.
Scratches can irritate your skin, but they tend to heal quickly. Some scratches are white against the skin, while others redden slightly. With dermatographia though, the scratches worsen, causing deep wounds or even allergy-like reactions.
I've attached pictures of my hand showing what exactly it looks like if you're suffering from dermatographia