Dermatographia or "Skin Writing"
Dermatographic urticaria aka dermographism or "skin writing" is a skin disorder and one of the most common variety of urticaria.
Urticaria, also known as hives, weals, welts or nettle rash – is a raised, itchy rash that appears on the skin. The rash ranges in size from a few millimetres to the size of a hand.
An interesting short note for your reference