A bullet wound’s appearance depends on whether you are looking at where the bullet entered or where it left, how far away the gun was fired, what kind of weapon was used, and what body tissue the bullet passed through. Entry wounds are typically small and roughly round, often smaller than the bullet itself, while exit wounds tend to be larger and more ragged. But those are generalizations, and the real picture is far more variable than most people expect from what they have seen in movies or crime dramas.
How Entry Wounds Look on Skin
The typical entry wound on skin is a round or oval hole surrounded by a ring of abraded, reddish-brown skin called an abrasion collar. This collar forms because the bullet scrapes and compresses the edges of the skin as it pushes through. Skin is elastic, so it stretches inward and then snaps back after the bullet passes. The result is a permanent hole that is actually smaller than the bullet’s diameter. Research on how skin behaves during bullet impact has confirmed that only the central portion of the struck skin is driven into the wound channel, while the surrounding tissue stretches radially and then rebounds, leaving a defect that is mostly smaller than the caliber of the projectile.1PubMed Central. Differing sizes of bullet entrance holes in skin of the anterior and posterior trunk
The shape and width of that abrasion collar are not uniform across all bullets. A study testing different bullet shapes found that round-nosed bullets produced the largest abrasion rings, while flat-tipped wadcutter bullets left the smallest. The entrance hole sizes showed the opposite relationship: flat-tipped bullets left bigger holes, and round-nosed bullets left smaller ones.2PubMed. The influence of the bullet shape on the width of abrasion collars and the size of gunshot entrance holes So the simple “small round hole” picture of an entry wound is really just an average. Bullet design, angle of impact, and the location on the body all shift the details.
Skin on the front of the torso does not behave identically to skin on the back, either. Differences in thickness, tension, and underlying support mean that an entry wound on the chest may look subtly different from one on the back, even if the same type of bullet caused both.1PubMed Central. Differing sizes of bullet entrance holes in skin of the anterior and posterior trunk
How Exit Wounds Differ
Exit wounds are where most of the dramatic variation happens. By the time a bullet reaches the exit side, it has often slowed down, tumbled, deformed, or fragmented. That instability means the bullet is no longer punching a neat circular path. Instead, it tears its way out, often producing an irregularly shaped wound that can be slit-like, stellate (star-shaped), or just a messy gash. Exit wounds are typically larger than their corresponding entry wounds. A study comparing entry and exit defects in skull bone confirmed that in all but one case, exit wounds were larger than the entrances caused by the same shot, a result consistent with the bullet’s deformation and instability after passing through tissue.3PubMed. Gunshot wounds to the skull: comparison of entries and exits
Exit wounds usually lack an abrasion collar because the bullet is pushing outward through the skin from the inside rather than scraping across the surface. This absence is one of the main ways forensic examiners distinguish exits from entries. However, there is a well-known exception that creates confusion.
When an Exit Wound Mimics an Entry Wound
If a person’s body is pressed against something firm at the moment a bullet exits, such as a wall, a car seat, or even a tight belt, the skin gets sandwiched between the outgoing bullet and that hard surface. The result is called a shored exit wound, and it develops its own version of an abrasion collar. The skin is impaled, crushed, and torn between the bullet and the unyielding backing, which leaves an abraded margin that can look disturbingly similar to an entry wound at first glance.4PubMed. Shored gunshot wound of exit. A phenomenon with identity crisis
There are differences if you look closely. The abrasion collar on a shored exit wound tends to have a scalloped or punched-out appearance, and the skin between the radiating tears is more sharply contoured compared to the smoother abrasion ring of a standard entry wound. Forensic pathologists pay close attention to these details, because misidentifying the direction of fire can derail an entire investigation.4PubMed. Shored gunshot wound of exit. A phenomenon with identity crisis
How Firing Distance Changes the Wound
The distance between the muzzle and the body is one of the biggest factors shaping what a gunshot wound looks like. At longer ranges, the wound is essentially just the bullet’s effect: a round entry hole with an abrasion collar and soot-free margins. But as the muzzle gets closer, additional elements from the discharge start leaving marks on and in the wound.
At intermediate distances, unburned and partially burned gunpowder grains travel far enough to pepper the skin around the entry wound, creating a pattern of tiny abrasions called stippling or tattooing. The density and spread of this stippling can help estimate how far away the gun was. At close range, soot and gases from the muzzle deposit directly onto and into the skin, leaving a dark, sooty halo around the wound. At contact or near-contact range, hot expanding gases from the barrel follow the bullet into the wound, inflating the subcutaneous tissue. Over bone, this can produce a stellate or star-shaped laceration as the skin tears under pressure from the expanding gases beneath it. This is especially dramatic with contact wounds to the head, where the gases enter the skull and have nowhere to go, blowing the overlying skin outward. The overall picture of these wound patterns, from clean distant wounds to soot-rimmed contact injuries, is well documented across forensic literature.5PubMed Central. Gunshot Wound Patterns: A Narrative Review From a Forensic Medical Perspective
Handgun Wounds Versus Rifle Wounds
The type of firearm matters enormously for what the wound looks like beneath the surface, and to some extent on the surface as well. The key difference comes down to how fast the bullet is traveling and how much energy it dumps into tissue.
Standard handgun bullets, which are relatively slow-moving and often remain intact, primarily crush tissue directly in their path. The wound track from a non-deforming handgun round is essentially a narrow channel of destroyed tissue with limited damage beyond the bullet’s immediate path.6PubMed. Wound ballistics 101: the mechanisms of soft tissue wounding by bullets Rifle bullets travel much faster and transfer far more kinetic energy. When a rifle bullet destabilizes or deforms inside tissue, it creates a temporary cavity, a brief expansion of tissue around the wound track that can stretch to 10 to 30 times the size of the permanent wound channel.7PubMed Central. Gunshot Wounds: Ballistics, Pathology, and Treatment Recommendations, with a Focus on Retained Bullets That momentary stretch tears blood vessels, damages muscle fibers, and can injure structures that the bullet never physically touched.
The visible difference this makes at the exit wound is striking. A multicenter study comparing high-velocity rifle wounds with lower-velocity handgun wounds found that exit wound dimensions were significantly larger in the rifle group. The ratio of exit wound size to entry wound size was also much higher for rifles, to the point that researchers concluded this ratio could serve as a useful indicator of which type of weapon was involved.8PubMed. The wounding potential of assault rifles: analysis of the dimensions of entrance and exit wounds and comparison with conventional handguns In practical terms, a handgun exit wound might be modestly larger than the entry, while a rifle exit wound can be dramatically larger, sometimes several times wider.
Why the Same Bullet Looks Different in Different Organs
Not all tissue responds to a bullet the same way. The physical properties of the organ matter as much as the bullet’s characteristics. Dense, fluid-filled organs like the liver, spleen, and kidneys are relatively stiff. When a bullet passes through them, the rapid temporary stretch exceeds what the tissue can tolerate, producing radiating tears that fan out from the bullet’s path in a stellate pattern.9PubMed Central. Gunshot wounds in parenchymatous organs: the morphology mainly depends on the physical properties of the affected tissues
Lung tissue, by contrast, is spongy and filled with air. It is far more elastic and can absorb the momentary deformation without tearing apart. Research has shown that gunshot injuries to the lungs from standard handgun rounds typically lack the radiating ruptures seen in the liver or kidneys. Instead, the damage is confined to a neat, roundish hole only slightly larger than the bullet.9PubMed Central. Gunshot wounds in parenchymatous organs: the morphology mainly depends on the physical properties of the affected tissues This same elasticity and low density is why lungs sometimes show a visible “bullet track” on chest X-rays, a narrow streak along the bullet’s path that may not appear immediately but shows up on follow-up imaging. In denser organs like the brain or liver, so much tissue destruction occurs that a clean track is rarely visible.10PubMed. Radiographic appearance of bullet tracks in the lung
What Bullet Wounds Look Like in Bone
Bone injuries from gunfire have their own set of visual signatures, and they are especially important in forensic work because bone preserves evidence long after soft tissue is gone. The classic teaching is that entry wounds in the skull show inward beveling (the hole is wider on the inner surface of the skull) while exit wounds show outward beveling (wider on the outer surface). A study of exit wounds in skull bones found outward beveling in roughly two thirds of cases, which supports the general rule but also reveals it is far from universal. Some bones, particularly around the eye sockets and the base of the skull, showed no beveling at all.11PubMed. Bevelling in exit gunshot wounds in bones
Entry wounds can also break the rules. Research has documented that handgun bullets striking the skull can produce external beveling at the entry site, particularly when the bullet hits at a tangential angle or, more commonly, when it strikes perpendicular to the bone surface. In some cases, this external beveling was partially or completely circumferential around the entry hole.12PubMed. External beveling of entrance wounds by handguns The practical takeaway is that beveling direction is a useful clue but not a foolproof indicator of which way a bullet traveled.
Keyhole Wounds and Tangential Impacts
When a bullet strikes bone at a shallow angle rather than head-on, the wound can take on a distinctive shape that forensic scientists call a keyhole lesion. The classic keyhole defect has two parts: a rounded portion where the bullet initially penetrated (with inward beveling) and an adjacent triangular or elongated portion where it exited (with outward beveling), all in one continuous wound. The result looks something like a keyhole or a golf tee from above. These wounds have historically been associated with tangential, glancing strikes.13PubMed. A ‘keyhole lesion’ gunshot wound in an adipocere case
More recent work has complicated this picture. Experimental studies have produced keyhole-shaped defects even with shots fired perpendicular to the skull, challenging the assumption that a keyhole always means a tangential trajectory. Researchers have proposed that concentric fractures radiating outward from the impact point play a larger role than previously appreciated in shaping the final wound pattern.14PubMed. The mechanism of the keyhole lesion reassessed: An experimental approach Keyhole wounds to the cranium remain rare overall, but they are forensically important because they can be mistaken for two separate wounds or misinterpreted regarding the shooter’s direction.15Forensic Anthropology. What Does a Bullet Wound Look Like?
Retained Bullet Fragments and Long-Term Appearance
A large share of people who survive gunshot wounds leave the hospital with bullet fragments still inside their body. A trauma registry analysis over one year found that among nonfatal gunshot cases, about three quarters had retained bullet fragments. Only about one in ten had complete fragment removal during their initial hospital stay, while nearly three quarters had no removal at all, usually because the fragments were in locations where removal would cause more harm than leaving them in place.7PubMed Central. Gunshot Wounds: Ballistics, Pathology, and Treatment Recommendations, with a Focus on Retained Bullets
For most patients, a retained fragment causes no visible external change beyond the original scar. Soft tissue was the most common location for retained fragments in that study, and the majority of patients who returned for follow-up had no complications. About one in nine who came back did develop a retained-bullet-related problem, on average roughly four months after the injury, with a small number requiring surgical removal.7PubMed Central. Gunshot Wounds: Ballistics, Pathology, and Treatment Recommendations, with a Focus on Retained Bullets The healed wound itself typically leaves a depressed, round or oval scar at the entry site and a wider, more irregular scar at the exit. Over time, both can fade to flat white or pinkish marks, though keloid scarring or contracture can develop depending on the individual’s healing tendencies and the extent of tissue loss.
How Muscle Responds to High-Energy Impacts
Muscle is particularly vulnerable to the temporary cavitation effect, especially from high-velocity projectiles. When the temporary cavity stretches muscle fibers, it can cause clotting within muscle cells, bleeding into the spaces between fibers, structural damage to the striations that let muscle contract, and swelling of individual fibers to several times their normal diameter. Together, these effects contribute to severe localized swelling that can raise pressure inside a muscle compartment to dangerous levels, a condition surgeons call compartment syndrome.7PubMed Central. Gunshot Wounds: Ballistics, Pathology, and Treatment Recommendations, with a Focus on Retained Bullets The external appearance of this is a limb or area that becomes tense, swollen, and discolored well beyond the visible wound itself, sometimes leading people to underestimate how small the entry wound looks compared to the damage underneath.
Less-Lethal Projectile Wounds
Not all projectile injuries come from conventional ammunition. Rubber bullets and other so-called less-lethal kinetic projectiles produce a distinctly different wound pattern. These are blunt-nosed, slower-moving projectiles (traveling at roughly 70 meters per second, compared to several hundred meters per second for a standard handgun round) that are designed to incapacitate without penetrating the body. Because the tip is blunt rather than pointed, rubber bullets deliver their energy through compression and crushing rather than penetration. They also deform and flatten on impact, which spreads the force over a wider area.16PubMed Central. Pattern of rubber bullet injuries in the lower limbs: A report from Kashmir
The resulting injuries tend to look very different from conventional gunshot wounds. Instead of a small round entry hole, rubber bullet impacts typically produce large contusions, skin lacerations, and underlying fractures. The bullets are unstable in flight and can tumble end over end, meaning they sometimes strike sideways rather than tip-first, creating irregular wound shapes. They also generate shock waves on impact that can cause fractures and lacerations in the area surrounding the strike.16PubMed Central. Pattern of rubber bullet injuries in the lower limbs: A report from Kashmir At close range or when striking vulnerable areas, these projectiles can penetrate the skin and cause injuries that begin to resemble conventional gunshot wounds, blurring the visual distinction.
What Forensic Examiners Look for Beyond Appearance
Visual appearance alone does not always tell the full story, and forensic investigators use additional markers to distinguish features that the eye cannot resolve. One question that comes up in death investigations is whether a wound was inflicted before or after death. Research into chemical markers in wounded tissue has found that iron concentrations in skin and muscle are significantly elevated in wounds made while a person was alive, compared to both unwounded tissue and wounds inflicted after death. The ratio of certain electrolytes in wounded muscle also shifts in living tissue but not in postmortem tissue.17PubMed. Diagnostic value of ions as markers for differentiating antemortem from postmortem wounds These chemical differences are invisible to the naked eye but can be decisive when the visual evidence is ambiguous, such as in decomposed remains or heavily treated surgical wounds where the original wound characteristics have been obscured by medical intervention.
The intersection of medical treatment and forensic evidence is its own problem. Emergency surgery, debridement of damaged tissue, drain placement, and fasciotomy incisions to relieve compartment syndrome can all alter or destroy the original wound margins. A surgical team’s first priority is keeping the patient alive, not preserving wound characteristics for investigators. This means that in surviving patients, the original entry and exit wounds may be unrecognizable by the time a forensic examiner gets to see them. Photographs taken in the emergency department before surgery, when they exist, become critical forensic evidence.