Several types of injuries or skin conditions can resemble large, bloody stretch marks. One of the more common conditions is lacerations or tears in the skin. These are deep cuts that can look like stretch marks if they run parallel along the skin, and they may bleed significantly if they penetrate through blood-rich tissues.
Another possibility is bruising or hematoma. Subdermal hematomas, when a significant blood vessel is damaged, can cause blood to pool under the skin, creating long, streak-like discolorations. When such bruises heal, they may develop a reddish or purplish hue, giving an appearance somewhat akin to bloody stretch marks.
Contact dermatitis or severe allergic reactions can also mimic this look. If the skin is scratched aggressively, due to itching, it can leave lines or streaks that might look like stretch marks mixed with blood if the skin breaks in the process.
Infections like cellulitis, which result in inflamed red skin as well as possible breakdown of the skin layers, could resemble bloody stretch marks if the inflammation stretches out or aligns in long streaks due to swelling.
Finally, trauma from external forces such as being whipped, suffering friction burns, or incurring abrasions from falls can create marks or scars similar in appearance to blood-filled stretch marks, depending on the severity and nature of the injury.
In every case, if there is uncertainty about the cause of such marks, a medical professional should be consulted to determine the appropriate diagnosis and treatment.