Rotting flesh changes color, texture, and shape in a predictable sequence, whether it’s tissue breaking down after death or living tissue dying from infection or poor blood flow. The earliest sign is a color shift: skin turns from its normal tone to red-purple, then progresses through green, brown, and eventually black as decay advances. Along the way, the tissue swells with gas, becomes slippery or slimy, and eventually breaks apart entirely.
What rotting flesh looks like depends on how far along the process is, what caused it, and whether it’s happening in a living person or after death. Here’s what to expect at each stage.
Color Changes Come First
The very first visible sign of flesh breaking down is a change in color. After death, blood stops circulating and settles into the lowest parts of the body by gravity. This creates red-purple patches on the skin, starting as early as 30 minutes to 2 hours after death. Initially the color is pink-red, but it darkens over several hours into a deeper blue-purple as oxygen leaves the blood. These patches reach full intensity within 6 to 9 hours and become permanently fixed in place after roughly 12 to 72 hours.
In living tissue, the color progression is similar but driven by infection or lost blood supply. Flesh-eating bacterial infections (necrotizing fasciitis) start with redness and swelling that looks like a bad skin infection. Within 24 to 48 hours, the skin darkens from red to purple to blue to black as small blood vessels clot off and tissue dies. The edges of the dying area become sharply defined, and the dead skin eventually forms a thick, dark crust that resembles a severe burn.
Green Discoloration and Marbling
As bacteria begin breaking down tissue from the inside, a distinctive green discoloration appears. In post-mortem decomposition, this typically starts in the lower right abdomen (where the large intestine sits closest to the skin surface) and spreads outward. The green color comes from bacteria converting hemoglobin in the blood into sulfur-containing compounds.
Shortly after, a pattern called marbling develops. This looks exactly like what it sounds like: a mosaic or web-like pattern of greenish-brown lines tracing the paths of superficial veins across the skin. It shows up most prominently on the roots of the limbs, abdomen, shoulders, chest, and neck. Marbling typically starts around 24 hours after death and becomes very noticeable by 36 to 48 hours. The overall skin color during this phase transitions through grey, green, brown, and eventually black.
Bloating and Gas Buildup
One of the most dramatic visual changes is bloating. As bacteria inside the body multiply, they produce large volumes of gas, primarily methane and hydrogen sulfide. This gas has nowhere to go, so it inflates the tissue. The torso swells first and most noticeably, but the face, limbs, and even the tongue can become distended. The eyes and lips may bulge outward. Skin stretched by gas takes on a tight, shiny appearance.
Eventually, the pressure causes the body to purge fluid and gas through natural openings. Once that happens, the bloated areas deflate and the tissue begins to sag and cave inward. The smell during this phase is intense, driven by the same sulfur compounds responsible for the green discoloration.
Skin Slippage and Tissue Breakdown
Rotting flesh loses its structural integrity in stages. At the microscopic level, the layers of skin begin separating from each other as early as 6 to 9 hours after death. Visible skin slippage, where the outer layer of skin loosens and slides off the underlying tissue when touched, typically begins between one and five days after death. The skin may peel away in sheets, and hair pulls out with no resistance.
During active decomposition, tissues slough off and fluids discharge as the membranes holding cells together degrade. The flesh becomes soft, wet, and fragile. The areas around the nose, eyes, ears, and lips darken and dry out faster than surrounding tissue because they’re thinner. What remains looks increasingly unrecognizable as the tissue loses its original form.
Late Stages: Mummification and Bone Exposure
If decomposition continues uninterrupted, the remaining soft tissue eventually dries out and hardens into a leathery, dark material. This mummified tissue can be black or white, and it clings tightly to the bone beneath it. There’s no moisture and no active breakdown at this point. Bones become increasingly visible as flesh is consumed by insects, bacteria, or environmental exposure. Full skeletonization, where only bone remains, is the final stage, though it’s common for dried or mummified tissue to persist on skeletal remains for a long time.
Gangrene in Living Tissue
In a living person, rotting flesh takes two distinct forms depending on whether bacteria are involved. Dry gangrene develops slowly when blood supply to a body part is cut off, often in the fingers, toes, or feet of people with diabetes or vascular disease. The tissue shrivels and dries out, turning brown to purplish-blue to black. It looks mummified while still attached to the body, and there’s a clear line between the dead tissue and the healthy skin beside it.
Wet gangrene looks very different. Bacteria actively infect the dying tissue, causing swelling, blistering, and a moist or weeping appearance. The tissue feels boggy and soft rather than dry and firm. It often produces a foul-smelling discharge. Wet gangrene spreads faster and is far more dangerous than dry gangrene because the bacterial infection can enter the bloodstream.
Necrotic Tissue in Wounds
Rotting flesh also appears in chronic wounds like severe pressure ulcers. In these cases, dead tissue takes one of two forms. Slough is soft, yellow or white, stringy dead tissue that sits on the wound surface. Eschar is harder and darker: a thick, leathery crust of dead tissue that can be brown or black. Both may produce a foul smell. In the most severe pressure ulcers, tissue death extends through the full thickness of skin and into underlying muscle, tendon, or even bone. Sometimes the dead tissue is so thick that it’s impossible to tell how deep the wound goes beneath it.
Factors That Change the Appearance
The speed and appearance of rotting flesh vary significantly based on conditions. Heat accelerates every stage. A body in a warm, humid environment can reach advanced decomposition in days, while cold or dry conditions can slow or halt the process entirely. Water immersion creates its own pattern, with the skin becoming pale, swollen, and eventually saponified (turned into a waxy, soap-like substance). Insect activity dramatically speeds up tissue loss, as fly larvae can consume soft tissue rapidly. In living patients, the presence of infection, blood flow, and immune response all alter how necrotic tissue looks and how quickly it spreads.
Skin tone also affects how early color changes are detected. The red-purple patches of early decomposition show up most dramatically on lighter skin, where they contrast sharply with surrounding tissue. On darker skin, the same process occurs but may be harder to spot visually until discoloration progresses further toward green or black.