Leprosy changes a person’s appearance gradually, and most people with the disease look completely normal for months or even years after infection. The earliest visible sign is typically one or a few patches of skin that are lighter or more faded than the surrounding area. These patches are flat, sometimes slightly dry, and often numb to touch. What happens beyond that depends entirely on how the immune system responds and whether the person receives treatment.
The disease exists on a spectrum. At one end, someone might have a single pale patch they barely notice. At the other, untreated cases can develop thickened facial skin, nodules, and nerve damage that changes the shape of the hands and feet. Most of what people picture when they think of leprosy reflects the most extreme, untreated end of that spectrum, which is increasingly rare today.
Early Skin Changes
The first thing most people notice is a patch of skin that looks lighter or slightly reddish compared to the rest of their body. These patches are flat, not raised, and their borders can be either sharp or blurry depending on the type. The skin in these areas often feels dry and may not produce sweat. Hair within the patch can thin or disappear entirely.
What makes these patches different from other skin conditions is numbness. A person with an early leprosy lesion typically cannot feel light touch, pain, or temperature changes in that spot. This is the key distinction from look-alike conditions: vitiligo causes white patches but sensation remains normal, and fungal infections like tinea versicolor produce scaly discolored patches that still have full feeling. A faded patch of skin that you can’t feel is the hallmark early sign.
Some people also develop small, firm bumps beneath the skin during early stages. These rounded nodules are painless and can appear on the face, ears, or limbs.
Milder Forms: Few Lesions, Limited Damage
When the immune system mounts a strong response against the bacteria, the disease stays contained. This milder form typically produces one to three skin lesions, each smaller than about 10 centimeters. The classic lesion is a raised plaque with well-defined edges that slope inward, giving it a saucer-like shape. The surface is dry, scaly, hairless, and numb. The World Health Organization classifies cases with one to five skin lesions (and no bacteria detectable on skin tests) as paucibacillary, meaning the bacterial load is low.
A person with this form of leprosy might have a single pale, dry patch on their arm or back. It would be easy to overlook or mistake for eczema or a fungal infection. One nearby nerve may feel thickened or cord-like under the skin, but visible deformity is uncommon at this stage. With treatment, these lesions improve and the disease is curable.
Severe Forms: Widespread Skin and Facial Changes
When the immune system fails to control the bacteria, the disease spreads widely. This form produces more than five lesions, often dozens, distributed symmetrically across the face, trunk, and limbs. The WHO classifies this as multibacillary disease.
The progression follows a recognizable pattern. Early on, multiple faint patches appear with blurry edges that blend into surrounding skin. Sensation may still be normal at this point. Left untreated, these patches thicken and become firm. The thickening is most noticeable on the earlobes and face. Over time, the thickened skin develops into raised bumps (papules) and larger nodules, which first appear on the earlobes, then the buttocks, elbows, fingers, and genitals.
The facial changes in advanced untreated cases are what historically defined the image of leprosy. Deep furrows form across the forehead and cheeks. The brow ridges become more prominent. The nose, lips, and eyelids enlarge. The earlobes swell symmetrically. The skin takes on a waxy, coarsened texture. Eyebrows and eyelashes fall out, a feature called madarosis that occurs in 45 to 76 percent of advanced cases. Together, these changes create what clinicians call “leonine facies” because the face takes on a lion-like appearance. This is the most extreme presentation and only develops after prolonged untreated infection.
Nasal Changes
The nose is one of the earliest and most commonly affected areas in severe leprosy. Nasal symptoms can actually appear before any skin or nerve changes become obvious. The bacteria infiltrate the nasal lining, causing stuffiness, crusting inside the nostrils, mild nosebleeds, and a reduced sense of smell.
In advanced cases, the internal structures of the nose break down. The nasal septum (the wall between the nostrils) can collapse, causing the bridge of the nose to flatten or sink inward. This structural collapse contributes to the altered facial appearance and also makes the person more vulnerable to secondary infections inside the nasal cavity.
Nerve Damage and Hand and Foot Changes
Leprosy targets peripheral nerves, the ones running through the arms, legs, hands, feet, and face. As these nerves are damaged, three things happen: sensation is lost, muscles weaken, and the ability to sweat disappears in affected areas. The visible consequences of this nerve damage are often more striking than the skin changes themselves.
In the hands, damage to the ulnar and median nerves causes the small muscles to waste away. Without those muscles holding the fingers in their normal position, the fingers curl inward into a “claw” shape. The person loses grip strength and fine motor control. In the feet, damage to the nerve that lifts the front of the foot causes foot drop, where the foot hangs limp and drags during walking. This changes the way a person moves and increases the risk of tripping and falls.
The loss of sensation creates a secondary cycle of visible damage. When you cannot feel pain, you don’t pull your hand away from a hot pan or shift weight off a stone digging into your foot. Burns, cuts, and pressure sores go unnoticed. Plantar ulcers, open sores on the sole of the foot, are one of the most common visible signs in people living with leprosy-related nerve damage. These wounds heal slowly and can become infected, sometimes leading to tissue loss in the fingers or toes. The shortening or loss of digits historically associated with leprosy is not caused by the bacteria directly. It results from repeated unnoticed injuries and infections over years.
Eye Involvement
Leprosy can damage the facial nerve branch that controls the muscles around the eye. When the muscle that closes the eyelid weakens, a person may be unable to fully shut their eye, a condition called lagophthalmos. The eyelid stays partially open, even during sleep. Combined with the loss of the blink reflex and reduced corneal sensation, the eye is constantly exposed to dust, wind, and drying.
Over time, this exposure leads to corneal ulcers, scarring, and clouding. In severe untreated cases, the cornea can perforate and the front of the eye bulges outward. Loss of eyelashes (part of the same madarosis affecting the eyebrows) removes another protective barrier. Visible signs around the eyes include thickened or drooping eyelids, absent lashes and brows, and a wide, unblinking stare from the inability to close the lids fully.
How Treatment Changes Appearance
Modern multidrug therapy is effective at killing the bacteria and improving skin lesions. Pale patches fade or resolve. Nodules flatten. The skin gradually returns toward its normal texture. However, nerve damage that occurred before treatment began is often permanent. Claw hand, foot drop, and sensory loss may persist even after the infection is fully cured, which is why early diagnosis matters so much.
During treatment, some people experience what are called leprosy reactions, episodes where the immune system flares against remnants of dead bacteria. During these reactions, existing skin lesions can suddenly swell, turn red, and sometimes ulcerate. Nerves may become painful and enlarged. These episodes can occur before, during, or after completing treatment and require additional management to prevent further nerve damage.
What Most People With Leprosy Actually Look Like
The dramatic images that dominate historical depictions represent the far end of a spectrum that most people with leprosy never reach. The majority of the roughly 200,000 people diagnosed globally each year have a few pale, numb patches on their skin. They look like anyone else. Even in more advanced cases, early treatment with multidrug therapy prevents the progression to facial changes, claw hands, and the other severe features that shaped centuries of stigma around this disease.