Psoriasis vs Vitiligo vs Leucoderma: Clearing Up the Confusion

October 24, 2026

Psoriasis and vitiligo are two different conditions. Psoriasis causes raised, scaly, often itchy patches because skin cells build up too fast. Vitiligo causes flat, smooth patches that lose their colour because the pigment cells are lost. "Leucoderma" is simply an older word for white skin patches. In India it is often used to mean vitiligo, but it can also describe white marks from other causes, including the pale marks a healing psoriasis patch can leave behind.

If you are new to psoriasis, our guide What is Psoriasis? Types, Symptoms and Treatments covers the basics. This post focuses on telling these "white patch" and "scaly patch" conditions apart, and on why a dermatologist's opinion matters.

Key takeaways

Psoriasis patches are usually raised, scaly and often itchy. Vitiligo patches are flat, smooth and lose colour, usually without scale.
"Leucoderma" means white skin. It is a description, not one disease. Vitiligo is one cause; chemicals, healed psoriasis or eczema, and some infections are others.
Neither psoriasis nor vitiligo is contagious, and neither is caused by eating fish with milk or by "impure blood".
Studies suggest the two conditions occur together more often than chance, so having one slightly raises the odds of the other.
A pale patch that has lost feeling needs a doctor's check soon, because leprosy can look like this and is curable with early treatment.

Why people in India mix these up

In many Indian homes, any white or discoloured patch gets called "safed daag", "leucoderma" or sometimes just "skin allergy". Psoriasis on brown skin can also look different from textbook photos. The National Psoriasis Foundation notes that on darker skin, plaques often look thicker and appear purple, grey or deep brown rather than red [3]. When those plaques settle, they can leave lighter or darker marks for a while. That is how a person with psoriasis ends up being told they have "leucoderma", or how a person with early vitiligo is told it is "just psoriasis".

There is also a heavy social side. An Indian study in the Indian Journal of Dermatology, Venereology and Leprology described how vitiligo is surrounded by prejudice and taboos, and how it is sometimes confused with leprosy, which adds to the stigma, especially for young women and marriage prospects [6]. Getting the right name for a patch can take a lot of fear out of the situation.

Psoriasis vs vitiligo: the main differences

Feature	Psoriasis	Vitiligo
What is happening	Immune-driven inflammation; skin cells build up too quickly [3]	Pigment cells (melanocytes) are destroyed, likely by the immune system [2]
Feel of the patch	Raised, thick, rough	Flat and smooth, same texture as normal skin
Scale	Silvery-white or grey scale is common	Usually no scale
Colour	Red or pink on fair skin; purple, grey or dark brown on darker skin [3]	Lighter than your skin tone, white, or sometimes pink when active [1]
Itch	Common, along with burning or stinging [3]	Usually none; may itch when new or spreading [1]
Common places	Scalp, elbows, knees, lower back, nails	Face, hands, feet, arms; around the mouth, eyes and genitals [1]
Hair in the patch	Usually normal colour	May turn white (eyebrows, eyelashes, a white streak of scalp hair) [1]
Contagious?	No [3]	No

A simple "touch test" at home

Gently run a fingertip across the patch with your eyes closed. Psoriasis usually feels raised and rough, and may shed flakes. Vitiligo usually feels exactly like the skin around it; you only notice it by colour. This is a clue, not a diagnosis. Some conditions break these rules, so let a dermatologist confirm.

What "leucoderma" really means

Leucoderma (also spelt leukoderma) literally means "white skin". Doctors use it as a broad label for loss of skin colour. Common causes include:

Vitiligo: the most common cause of true, chalk-white patches.
Chemical (contact) leucoderma: pigment loss after repeated contact with certain chemicals. DermNet lists the adhesive in some bindis, para-phenylenediamine (PPD) in hair dyes and in black socks or shoes, and some rubber products as known culprits [7]. It can look almost identical to vitiligo. Many people regain colour once the trigger is stopped, though some go on to develop vitiligo [7].
Pale marks after inflammation: when a psoriasis or eczema patch settles, the skin underneath may stay lighter for a while. In one case-control study, psoriasis lesions often healed with lighter skin that could be mistaken for vitiligo [5]. Our post on marks after psoriasis clears explains this in more detail.
Infections: some fungal infections and leprosy can cause pale patches. A pale patch with reduced or absent feeling is a classic leprosy warning sign [8].

So "leucoderma" on a prescription or in a family conversation does not automatically mean vitiligo. Ask your doctor which cause they suspect.

Can you have psoriasis and vitiligo together?

Yes, and it is not as rare as people think. A 2019 systematic review and meta-analysis of 10 studies found that people with psoriasis had about 2.3 times the odds of having vitiligo, and people with vitiligo had about 3.4 times the odds of having psoriasis, compared with people without either condition [4]. The authors noted that several included studies had a high risk of bias, so the exact numbers may change with better research [4].

Researchers think the two share some immune pathways and genetic risk areas, and both can show the Koebner response, where new patches appear on skin that has been scratched, rubbed or injured [5]. In practical terms, if you live with psoriasis and notice a new smooth, chalk-white patch that is not where a plaque used to be, mention it to your dermatologist rather than assuming it is a leftover mark.

How doctors tell them apart

Most of the time a dermatologist can tell the difference by looking carefully and asking a few questions: where the patch started, whether it was ever red and scaly, whether it itches, whether any hair has turned white, and whether anyone in the family has psoriasis, vitiligo or thyroid disease. Vitiligo is more common in people with certain other autoimmune conditions, such as thyroid disease [2].

Doctors may also look at the skin under a handheld ultraviolet lamp, test for sensation in the patch, or, less often, take a small skin sample. Our article on psoriasis in darker skin tones explains why a careful look matters so much on brown skin.

Treatment paths are different

Because the conditions work differently, their treatment plans differ too. Psoriasis is managed with moisturisers, prescription creams, phototherapy, tablets or biologics depending on severity. Vitiligo options listed by the US National Institutes of Health include prescription creams, phototherapy, some oral medicines and, for stable patches, skin grafting [2]. Some therapies, such as phototherapy, are used for both, but under a doctor's supervision and with different goals. Never start or stop a prescribed treatment on your own.

Daily care that suits both

Be gentle. Avoid scrubbing, picking scales or harsh loofahs. Injury can trigger new patches in both conditions [5].
Moisturise psoriasis patches daily. A fragrance-light cream or oil after bathing helps with dryness and itching. If you want to explore plant-based options, our body care range for psoriasis-prone skin is steroid-free and may help soothe dry, flaky areas. These products are not meant for treating vitiligo.
Protect white patches from the sun. Skin without pigment burns easily. Use shade, clothing and a broad-spectrum sunscreen on vitiligo patches, especially in Indian summers.
Watch out for chemical triggers. If a white patch appears exactly under your bindi, watch strap, footwear or hairline after dyeing, stop that product and show the patch to a dermatologist [7].
Be careful with home remedies. Babchi (bakuchi) is traditionally used in Ayurveda for white patches, but it contains psoralens that make skin far more sensitive to sunlight. Applying it and then sitting in the sun can cause painful blisters and burns. Avoid it in pregnancy and in children unless a qualified doctor guides you. Read our guide to babchi oil and sun safety first.

When to see a doctor

Book an appointment with a dermatologist (at a government medical college hospital or a private clinic) if:

A pale or white patch has reduced feeling, numbness or tingling, or you notice painless cuts or burns on your hands or feet. This needs prompt checking for leprosy, which is curable with antibiotics [8].
New white patches are appearing quickly or spreading to the face, lips or around the eyes.
A patch is not where a psoriasis plaque used to be, or the hair inside it has turned white.
A white patch appears after using a new bindi, hair dye, footwear or skin-lightening cream.
Your psoriasis is spreading, cracking, bleeding, pus-filled, or comes with fever or joint pain.
You have been told it is "leucoderma" but nobody has explained the cause.
The patches are affecting your sleep, mood, studies, work or marriage discussions. Emotional support is part of good care.

Frequently asked questions

Can psoriasis turn into vitiligo?

No, one does not change into the other. But psoriasis can leave temporary pale marks that look like vitiligo, and studies show the two conditions occur together more often than expected [4] [5].

Is leucoderma the same as vitiligo?

Not exactly. Leucoderma means any loss of skin colour. Vitiligo is the most common cause, but chemicals, healed rashes and some infections can also cause it [7].

Are psoriasis or vitiligo contagious?

No. You cannot catch either condition by touching, sharing food or living with someone who has it [3].

Does vitiligo itch like psoriasis?

Usually not. Vitiligo patches may itch a little when they first appear or are spreading, but they are rarely uncomfortable otherwise. Psoriasis itch is common and can be intense [1] [3].

Does eating fish with milk cause white patches?

There is no scientific evidence for this common belief. Vitiligo is linked to the immune system and genes, not to food combinations [2].

Sources

This article is for general information and is not medical advice. Please consult a qualified dermatologist or Ayurvedic doctor for diagnosis and treatment.

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