Last Updated on 10th March 2026 by Caroline Haye
A ticklish subject – but worth scratching the surface!
If you have vitiligo I’m sure you will at some point have asked the question “why?” What caused this? There must be a reason why my skin, hair or lashes are randomly turning white. Surely this can’t be normal, so what is going on? And if this prompted you (as it did me) to research the subject, you will I’m sure, have realised that the answer is far from simple.
Scientists know a lot more about the mechanisms behind vitiligo today than they ever have before. That’s the good news. But they are the first to admit that they still don’t have all the answers. What they do know is that there is no single cause of vitiligo. In fact, there are a variety of factors that can trigger the depigmentation process. These factors include genetics, environmental effects, oxidative stress, autoimmune response, hormonal triggers, physical injury and mental trauma.
Any one or more of these factors can set the vitiligo process in motion and might provide a clue as to the cause of your vitiligo. But in this post I want to explore a different possibility… A potential vitiligo pathway that is hardly ever discussed – one that might be unpleasant to contemplate but that I believe is worth researching. I’m going to ask the question, can parasites cause vitiligo?
Putting parasites into perspective
The very mention of worms, lice or mites is enough to make most of us start squirming and scratching. But, in fact, parasites are just a natural part of the food chain. And, since they make up an estimated 40 percent of all animal species in existence, they are clearly a vital part of the earth’s ecosystem.
However, as crucial as they are to biodiversity, they are understandably not a popular topic of conversation at the dinner table. And, despite the fact that we all play host to millions of harmless microscopic organisms throughout our life, we tend to associate the word parasite with uncleanliness and disease.
We generally find the idea of tiny “alien monsters” living in, or on, another creature disgusting and prefer not to think about it at all in relation to our own body. But the fact is that many of the organisms that hitch a ride on human beings are a perfectly healthy part of our own microbiome and cause us no problems at all.
On the other hand, certain parasites can lead to some nasty diseases in humans, as well as in other animal species and plants. And even those that would normally coexist with their host in perfect harmony sometimes wreak havoc on their health if parasite populations multiply out of control, causing an imbalance.
How might parasites trigger vitiligo?
The first point I should emphasise here is that vitiligo is not always a result of parasitic infestation. Far from it. In fact, from what I have read, this probably accounts for a small minority of vitiligo cases when compared to genetics, trauma and other environmental and health factors. And the second, equally important point to stress is that, just because an individual picks up a parasite, this does not mean that they will necessarily develop vitiligo. (Again, this scenario is relatively uncommon.) It’s not as if vitiligo is a disease like malaria, that is carried and transmitted by insects. Vitiligo is not an infection. It is a pigmentation disorder that occurs when a susceptible person is exposed to certain risks or triggers. However, that process may, on occasions, occur in a number of different parasite-related ways. For example…
Inflammation
Certain types of invasive parasites – or even an overpopulation of otherwise harmless ones – cause inflammation in the body, releasing cytokines that might then damage melanocytes (pigment cells), leading to depigmentation of the skin, hair or lashes in the worst affected areas.
Oxidative stress
Parasitic infestation can also cause oxidative stress in the body, which is a well established contributing factor in the development of vitiligo.
Autoimmune response
The presence of intestinal worms can increase gut permeability (creating a “leaky gut“) and allow parasite and food particles to enter the bloodstream. This might then trigger an immune response that mistakenly attacks melanocytes, leading to vitiligo.
Koebner effect
Skin mites, head lice or other parasites that live on human skin or in our hair follicles often cause intense itching, prompting us to scratch the affected areas. Trauma and inflammation result from the scratching and set in motion the so-called koebnerisation and depigmentation of those areas.
Tissue damage
Parasites can directly damage hair follicles, potentially leading to hair loss (alopecia). And, because the melanin that produces hair colour is synthesised in the hair follicles, depigmentation of the hair can also result.
Poor nutritional absorption
Intestinal worms (helminths) can deprive their host of food to the extent that they steal much of its nutritional value, leaving the individual lacking in certain vitamins and minerals. And this, alongside the damage the parasites cause to the digestive system, puts the individual at greater risk of developing various skin conditions, including vitiligo.
Which parasites are most likely to trigger vitiligo?
In theory, virtually any parasite could trigger one of the responses listed above. But research suggests that some organisms are more often associated with depigmentation than others, possibly because of their particular action on the host or possibly because they are simply more common.
Intestinal parasites
Tapeworms, roundworms and pinworms are all happy to find a home in the human intestine, given half a chance… As are flukes – a type of flatworm that can take up residence in other human organs too, like the lungs, liver and blood. Some studies strongly suggest that intestinal parasites may play an active role in the development of vitiligo. But it looks like more research would be needed before scientists fully understand the mechanisms underlying this process.
Skin parasites
Skin-dwelling parasties (ectoparasites) include lice, mites, ticks, fleas, and bedbugs. Some, such as scabies mites and hookworm larvae, burrow into the skin, whilst others live on the surface of the skin or in hair follicles. And one of the most widespread examples of the latter is…
Demodex
Demodex mites are microscopic arachnids (yes – from the same broad class of creepy crawly as spiders) that typically live in hair follicles and on oily areas of our facial skin, without causing any symptoms. In fact, most adults have them and their numbers usually increase with age. But, if the thought of tiny spiders inhabiting your lashes freaks you out, it’s worth bearing in mind that they actually perform a useful task by eating dead skin cells, excess oil and bacteria. However, an overpopulation of these otherwise harmless organisms on the face can cause inflammation (known as demodicosis), which can potentially lead to pigment loss. And too many mites in the lashes can cause inflamed lids (blepharitis) and even loss of eyelashes (madarosis).
Although there are no major studies confirming a direct cause and effect between demodex infestation and vitiligo, clinical observations and case reports indicate that there are links, if only indirect ones. And, interestingly, some experts describe multiple common allergies and skin conditions (vitiligo included) that may form part of a wider “demodex syndrome“.
How likely am I to have parasites and will they give me vitiligo?
If you are an adult, you almost certainly have demodex mites, but the chances are that they will not cause you any health issues at all. Of course, anyone can pick up a common tick or two, simply by walking through long grass, or suffer a mosquito or horsefly bite. But these are not infestations; more like brief encounters! And they are usually easy to treat, although any skin trauma could potentially trigger vitiligo. So it is always a good idea in these circumstances to reduce inflammation as quickly as possible and avoid scratching the affected skin.
Common childhood parasites in western countries include threadworms (a.k.a. pinworm) and head lice, both of which are easily transmitted from one child to another. Again, these are relatively easy to treat. But the same indirect risk for children with a genetic predisposition to vitiligo presumably applies, the temptation to scratch being the main one.
Higher risk regions (with some of the nastier parasites)
The risk of other types of parasite infestation is more dependent on environmental and lifestyle factors. For example, where in the world you live, the quality of your drinking water, what animals you come into contact with, what hygiene levels you are able to maintain, etc. That being the case, risks are higher in developing countries where poverty, poor sanitation, overcrowding and the effects of hot climates are more prevalent than in the developed countries.
Added to that, some parts of the world have more than their fair share of troublesome parasites. In sub-Saharan Africa and certain other tropical regions, for example, the onchocerca volvulus worm causes a condition known as River Blindness. This parasite also causes severe, chronic skin infections, resulting in “leopard skin”, a condition involving permanent depigmentation, especially on the shins.
Another particularly unpleasant parasite, found in tropical and subtropical regions and parts of southern Europe, is the leishmania parasite, which causes skin sores (and depigmentation), organ infections and even death if left untreated.
Conclusion
If you have made it to the end of this post, well done you! I hope it has been informative without creeping you out. It surprised me to learn just how common parasites are in our daily environment, as well as out there in the wider world. But I have realised that, unless we spend significant time in the rural areas of certain high risk regions without access to medicines, most of us are unlikely to suffer any really harmful or life-threatening effects from any of these organisms. And those we are more likely to encounter at home are either harmless enough to go unnoticed or they are easy to diagnose and treat effectively.
So my aim in choosing this ticklish theme was not to cause alarm or give anyone the heebie-jeebies. Having delved into the topic, it seems unlikely that parasites are a major cause of vitiligo. But it is clear that they are a risk factor and can also trigger other pathways to depigmentation, especially in anyone with a predisposition to vitiligo. And, because I believe that knowledge is power, I think that knowing there is a risk is always better than not knowing. So, for that reason if no other, I hope you agree that the read was worth the effort.
