Red lines on the skin that look like scratches are often caused by dermatographism, especially if they appear within minutes after rubbing, scratching, pressure, or tight clothing. The lines may be red, raised, and itchy, and they often fade within about 15 to 30 minutes.
Dermatographism is a type of skin reaction in which light pressure causes temporary welts along the path of the contact. If this keeps happening for at least 6 weeks, it may be considered a form of chronic inducible hives. Persistent red or purple lines that remain for days or longer may instead be stretch marks, particularly when the skin has been stretching.
Other patterns deserve attention. Actual scratches may leave broken skin, crusting, or bleeding, while a very itchy, raised, winding line that slowly moves over several days can have a different cause, particularly after travel or barefoot contact with soil or sand. Learn more about dermographism and its treatment.
Pay attention to how quickly the lines appear, how long they last, whether they itch or hurt, and what seems to trigger them. If they keep returning, persist, or are difficult to explain, see a dermatologist for assessment rather than treating them on your own.