Graft versus host disease (GVHD) most commonly first appears as a red, flat or slightly raised rash on the palms of the hands, soles of the feet, or face. From there it can spread across the body, and over time it may affect the mouth, eyes, and other organs, each with its own visible signs. What GVHD looks like depends heavily on whether it’s the acute form, which typically develops within the first 100 days after a stem cell transplant, or the chronic form, which emerges later and can change the skin’s texture in ways that look quite different from the initial rash.
The Acute Skin Rash
The earliest and most recognizable sign of GVHD is a maculopapular rash, meaning it shows up as flat red patches mixed with small raised bumps. It often starts on the palms, soles, and face before spreading to the trunk and limbs. In mild cases, less than 25% of the body surface is affected. Moderate cases cover 25 to 50%, and severe cases spread beyond half the body. At its worst, the skin can blister and peel off in sheets, resembling a severe burn.
The rash is often itchy or painful and can range from faintly pink to deep red. One distinguishing feature: when a rash involves both the face and the palms and soles at the same time, it strongly points toward GVHD rather than a drug reaction, which is one of the conditions doctors need to rule out. A drug-related rash almost never hits both locations simultaneously. Doctors also look for diarrhea and signs of liver involvement alongside the rash, since that combination together is highly suggestive of GVHD rather than a medication side effect.
How Chronic GVHD Changes the Skin
Chronic GVHD looks very different from the acute rash. Instead of red bumps and patches, the skin gradually thickens and tightens. In some people this resembles scleroderma, an autoimmune condition where the skin becomes hard, shiny, and difficult to pinch or move. The affected areas may develop an “orange peel” texture with enlarged, visible pores. Over time the skin loses its elasticity, which can restrict movement in the joints underneath, reducing range of motion, strength, and the ability to perform everyday tasks.
Color changes are common. Patches of skin may become noticeably lighter or darker than the surrounding area. Some people develop poikiloderma, a distinctive pattern that combines redness, changes in pigmentation, and tiny visible blood vessels (small red or purple thread-like lines on the skin’s surface). Hair loss can occur in affected areas. Nails may become thin, concave, or spoon-shaped, and the nail surface can develop ridges or become brittle and crumbly.
Ulcers can form on hardened skin, especially in areas subject to friction or pressure. These features, particularly the skin tightening and poikiloderma, are considered “diagnostic” for chronic GVHD, meaning they’re distinctive enough on their own to confirm the condition without additional testing.
Mouth and Lip Changes
Chronic GVHD frequently targets the inside of the mouth, and the appearance is quite specific. The most recognizable sign is a pattern of white, lacy lines on the inner cheeks, tongue, or gums that resembles a condition called lichen planus. These white streaks, sometimes called reticular striae, look like a fine web or net draped across the tissue. They’re considered so characteristic of GVHD that their presence alone is enough to confirm the diagnosis.
Beyond the white patterns, the mouth lining may appear red and inflamed, and painful ulcers can develop. The salivary glands are often affected too, leading to persistent dry mouth that makes eating, speaking, and swallowing uncomfortable. In more advanced cases, the soft tissue around the lips and cheeks can stiffen and scar, making it harder to fully open the mouth.
What It Looks Like in the Eyes
Eye involvement is extremely common, affecting more than 60% of people with GVHD. In the acute phase, the most visible signs are redness and increased mucus discharge. In one study, every patient with acute eye GVHD had noticeable mucus secretion, and about 90% had visibly red eyes. Excessive tearing is also common early on. In more severe acute cases, a yellowish membrane can form on the inner surface of the eyelids.
Chronic eye GVHD looks and feels different. Severe dryness becomes the dominant problem, replacing the redness and watering of the acute phase. The eyes may feel gritty or sandy. The surface of the eye can develop visible damage: tiny string-like filaments on the cornea, cloudy or scarred patches, or in severe cases, visible blood vessels growing into the normally clear cornea. Corneal ulcers develop in roughly 8% of eyes with chronic GVHD, and in rare cases the cornea can thin to the point of perforation. The inner lining of the eyelids may develop scarring that’s visible when the lid is pulled down.
Liver and Internal Signs
Liver involvement in GVHD is tricky because it usually doesn’t produce visible signs. Most of the time, it’s caught through blood tests that show rising liver enzymes before any outward change appears. When liver GVHD does become visible, it shows up as jaundice: a yellow tint to the whites of the eyes and the skin. This yellowing tends to appear first in the eyes and then becomes noticeable on the face, chest, and eventually the rest of the body. Pain or a feeling of fullness on the right side of the abdomen, where the liver sits, can accompany the color change.
Diarrhea is the hallmark of gut GVHD. It can range from mild and watery to severe with cramping and, in some cases, visible blood. Nausea, vomiting, and loss of appetite often come alongside it. There’s no distinctive external visual sign the way there is with skin or mouth involvement, but the combination of diarrhea with a skin rash is one of the strongest clinical indicators that GVHD is the cause.
How Severity Is Graded
Doctors grade acute skin GVHD on a four-stage scale based on how much of the body is covered. Stage 1 means less than 25% of the skin surface is affected, and the rash is typically flat and patchy. Stage 2 covers 25 to 50%. Stage 3 means more than half the body is involved. Stage 4 is the most serious: more than 50% coverage with blistering or skin peeling. Each jump in stage generally reflects a more intense immune attack and requires more aggressive treatment.
Chronic GVHD is graded differently, focusing less on surface area and more on whether the changes are causing functional problems. Skin tightening that restricts joint movement, mouth scarring that limits how wide you can open your jaw, or eye damage that threatens vision all push the grading higher, regardless of how much skin surface is involved.
Telling GVHD Apart From Other Rashes
After a stem cell transplant, patients take multiple medications that can cause rashes of their own, making it difficult to know at first glance whether a new rash is GVHD or a drug reaction. Location is one of the most useful clues. A rash that appears on both the face and the palms and soles is far more likely to be GVHD. In one study, 36% of GVHD patients had this combined pattern compared to zero patients with drug reactions. Context matters too: a skin rash accompanied by diarrhea and elevated liver markers points strongly toward GVHD, while a rash without any gut or liver symptoms is less likely to be GVHD.
A skin biopsy often provides the definitive answer. Under a microscope, GVHD shows a characteristic pattern of damage at the base of the outermost skin layer, along with inflammation and destruction of hair follicles and sweat glands. Drug reactions can look similar at a surface level, but the deeper structural damage to these glands is more specific to GVHD.