Hypertrichosis: Causes, Types and Everyday Hair Care
Hypertrichosis is excessive hair growth that goes beyond what is usual for a person’s age and sex, and it can appear anywhere on the body rather than only in the areas linked to male-pattern hair. It can be present from birth or begin later in life. Because the acquired form sometimes follows a medicine or an underlying illness, the sensible first step is a GP appointment rather than a razor.
Excess hair growth is about hair appearing where it is not expected, not about how much hair is on the head.
Key takeaways
- Hypertrichosis means hair growing in the wrong place or in the wrong amount for the person, and it is not the same thing as hirsutism.
- DermNet separates it into congenital forms, present from birth, and acquired forms that start later.
- The acquired form can follow certain medicines, poor nutrition, repeated rubbing of the skin, or, rarely, an illness that needs investigating.
- It is a hair excess problem, so it sits at the opposite end of the scale from hair loss, shedding and breakage.
- Hair removal is a personal choice. Nothing you buy in a shop makes a medical cause go away, so see a GP first.
What is hypertrichosis, and how is it different from hirsutism?
Hypertrichosis is hair growth that is excessive for a person’s age, sex and background, and it can show up anywhere on the body. Hirsutism is a narrower term: DermNet defines it as excess hair in women following a male pattern, on the face, chest, tummy and back. The distinction matters because it changes who you see and what they look at. Hirsutism points towards androgen levels, and the NHS names polycystic ovary syndrome as the most common reason behind it. The broader condition is not androgen-driven in the same way, so a hormone panel can come back entirely normal while the hair growth is still very real.
Both terms describe more hair, not weaker hair. That is worth saying plainly, because most hair content online is written for the opposite problem, and the advice in it can be actively unhelpful here.
What is the difference between vellus, terminal and lanugo hair?
Three hair types explain almost every conversation about excess growth. Vellus hair is the short, fine, pale hair that covers most of the body and lacks a medulla, the central core. Terminal hair is longer, thicker and pigmented, and it is what grows on the scalp, in the eyebrows and, after puberty, in androgen-sensitive areas. Lanugo is the fine unpigmented hair that covers a fetus and is normally shed around eight months of gestation, according to DermNet.
Which type is growing tells you a great deal. Terminal hair appearing in a female pattern on a woman points towards hirsutism and hormones. Lanugo hair persisting into adult life points towards a congenital form. Lanugo hair appearing suddenly on an adult face is the pattern DermNet calls malignant down, and it is the one that needs a prompt appointment.
What causes hypertrichosis?
Causes divide cleanly into congenital and acquired. DermNet describes the congenital form as a genetic condition, either inherited or arising from a spontaneous mutation, and notes that congenital hypertrichosis lanuginosa is extraordinarily rare, with only around 50 cases recorded worldwide since the Middle Ages. The acquired form is far more common and has a longer list behind it.
| Route | Typical trigger | What usually helps |
|---|---|---|
| Congenital | An inherited gene change or a spontaneous mutation present from birth | Specialist dermatology input and long-term cosmetic management |
| Medicine-related | Certain epilepsy medicines, some immune-suppressing medicines, anabolic steroids and some topical scalp products | A GP review of the medicine, never stopping it on your own |
| Nutritional | Malnutrition, including anorexia nervosa | Addressing the underlying nutrition with medical support |
| Local and mechanical | Repeated rubbing or scratching of one patch of skin, a plaster cast, increased blood supply to an area | Removing the irritation; localised growth often settles |
| Rare and important | Acquired lanuginosa, which can appear before a cancer is found | Urgent GP assessment, not cosmetic advice |
That last row is the reason this page does not lead with hair removal. Fine, silky, pale hair appearing suddenly on the face, especially on the nose and eyelids where hair is not normally visible, is uncommon. It is also the single strongest reason to book in with a GP rather than searching for a wax.
Excess hair growth can be localised to one patch of skin or spread across the body.
What are the main types of hypertrichosis?
Clinicians usually sort the condition four ways, and knowing which one is in play changes the conversation. Congenital lanuginosa means the fine lanugo hair that normally sheds before birth keeps growing throughout life. Congenital terminalis produces fully pigmented terminal hair over most of the body and is almost always accompanied by gum overgrowth and tooth problems. The generalised acquired form spreads widely and is the one most often linked to medicines, nutrition or illness. The localised acquired form is confined to a patch, often one that has been rubbed, scratched, plastered or repeatedly covered with something topical.
Localised forms are the ones most likely to settle on their own once whatever was irritating the skin stops. Generalised forms almost always need someone to look at the bigger picture first, because the hair is a signal rather than the whole story.
How do clinicians work out what is behind excess hair growth?
A GP starts with the timeline, because it does most of the work. When the growth began, how fast it spread, whether it is fine or coarse, whether it is one patch or the whole body, and what medicines were started in the months beforehand will usually narrow the list quickly. The NHS notes that a blood test can measure hormone levels where a hormonal cause is suspected, which separates hirsutism from the broader picture.
Beyond that, a GP may look for the associated features that go with specific forms, such as gum overgrowth in the congenital terminal type, or ask about weight, appetite and nutrition where malnutrition is possible. Referral to dermatology follows when the picture is unclear, the growth is generalised, or the onset was sudden in an adult. None of this is something a shop-bought product contributes to, which is why the honest advice is to get the assessment done before spending money on removal.
Does body hair change naturally with age, pregnancy or the menopause?
Yes, and telling ordinary change apart from a condition saves a lot of worry. The NHS is direct about this: lighter, finer hair on the face or body in women is usually not hirsutism at all, and most women get more of that type of hair as they get older, particularly after the menopause. Falling oestrogen shifts the balance between oestrogen and androgens, and follicles on the upper lip, chin and jawline respond to that shift. It is gradual, it is fine rather than coarse, and it is not a sign that anything has gone wrong.
Pregnancy pushes in the other direction for a while. Higher oestrogen keeps more follicles in the growing phase for longer, which is why hair often looks thicker in the second and third trimesters and why so many people then shed heavily a few months after the birth. That postpartum shed is telogen effluvium, a cycle problem, and it resolves on its own. The useful test in both cases is speed and texture: slow and fine is usually life, fast and coarse is worth an appointment.
A quick rule of thumb
Change measured in years, in fine pale hair, is usually ordinary ageing. Change measured in weeks or months, in coarse dark hair or in sudden downy facial hair, is worth a GP appointment.
How is hypertrichosis different from hair loss, shedding and breakage?
Three separate problems get lumped together as “hair issues”, and excess growth is none of them. Hair loss is follicular: the follicle itself miniaturises or is damaged, as in androgenetic alopecia or alopecia areata. Hair shedding is cyclical: follicles move into the resting phase early and release hair, which is what happens in telogen effluvium after illness, childbirth or stress. Hair breakage is a fibre problem: the strand snaps along its length from heat, bleach, friction or over-styling, so the follicle is fine but the length is not.
Excess growth is the mirror image of the first two. There is more hair, not less, and the follicles are doing what they are told rather too enthusiastically. If you want to understand the opposite end, our guides to how long telogen effluvium lasts and hormonal hair thinning cover it properly.
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What hair removal options do people use for unwanted hair?
Removal is a personal decision and there is no medical obligation to do anything at all. Shaving, waxing, threading, epilating and depilatory creams all work on hair that is already above the skin, cost very little and can be repeated indefinitely. Electrolysis works follicle by follicle and is the only method regarded as permanent. Laser works best where hair is dark and skin is lighter, because it targets pigment, which is why it is a poor fit for the pale lanugo hair seen in some congenital forms.
| Method | How long it lasts | Best suited to |
|---|---|---|
| Shaving | Days | Large areas, zero cost, no skin downtime |
| Waxing, threading, epilating | Two to six weeks | Face and smaller defined areas |
| Depilatory cream | Up to a week | People who react badly to blades; always patch test first |
| Laser | Months, with repeat sessions | Dark hair on lighter skin |
| Electrolysis | Permanent per follicle | Pale or fine hair, and small stubborn areas |
One practical warning worth repeating: repeated rubbing and irritation of a patch of skin is itself on DermNet’s list of causes for the localised form. Aggressive, frequent removal on the same small area is not always the neutral act it feels like. Rotating methods, giving skin recovery days and keeping the area moisturised all reduce that risk.
Do not stop a medicine on your own
If your hair growth started after a new medicine, take that observation to the GP or pharmacist who looks after it. Several of the medicines on DermNet’s list are controlling serious conditions, and stopping one without advice is riskier than the hair.
How should you care for scalp hair alongside excess body hair?
Scalp care does not change the condition, and nothing on this page is offered as a way to alter it. What it can do is make dense, coarse or long hair easier to live with day to day. Coarse hair tangles more, and tangles are where breakage starts, so the useful habits are the dull ones: condition every wash, detangle from the ends upwards with a wide-tooth comb on damp hair, and keep heat styling low and infrequent. A weekly deep conditioner earns its place if your hair is long enough to be dragged through a brush twice a day.
Gentle everyday washing and conditioning makes dense hair easier to manage.
Condition Me® Hair Growth Conditioner £13.95
A breakage-defence conditioner with cholesterol, shea butter and glycerin. It helps coarse, dense hair detangle with less snapping, which is the honest job a conditioner does.
Masque Me® Hair Mask £24.95
An 8-in-1 deep conditioning mask for once a week. Useful if length, coarseness or a frequent removal routine is leaving hair feeling rough.
If you also have thinning or breakage on the scalp, our guide to what actually stops hair snapping is the better starting point for that part.
How do you cope with the emotional side of a visible hair condition?
Visible hair conditions carry a social weight that has nothing to do with how medically serious they are. People report avoiding swimming, short sleeves, strong lighting and photographs, and the effort of a daily removal routine is real time out of a week. The NHS explicitly invites people to tell a GP when a hair problem is affecting their wellbeing, and that is not a throwaway line: distress is a legitimate reason to be referred on, not an add-on to the physical complaint.
Talking to a GP about the effect on your wellbeing is part of the conversation, not an afterthought.
Support groups for visible skin and hair differences exist across the UK and are worth finding early. People living with alopecia areata describe very similar ground, and much of the coping advice transfers even though the condition runs in the opposite direction.
Frequently asked questions
Is hypertrichosis the same as hirsutism?
No. It means excessive hair anywhere on the body and in either sex, while hirsutism specifically describes excess hair in women in a male pattern. DermNet keeps them as separate entries for this reason.
Can excess hair growth go away on its own?
Localised forms often settle once the trigger stops, for example when a plaster cast comes off or a patch of skin is no longer being rubbed. Congenital forms are lifelong. Medicine-related growth may ease after a GP reviews the medicine.
Does excess hair growth mean something serious is wrong?
Usually not. The important exception is fine, pale downy hair appearing suddenly on an adult face, which DermNet links to an underlying cancer in some cases. That pattern needs a prompt GP appointment.
Will a hair growth shampoo make it worse?
Watermans shampoos are cosmetic products for the scalp and are not designed to change body hair. If you are worried about any topical product, stop using it and ask your GP or pharmacist.
Is laser hair removal suitable?
It depends on the hair. Laser targets pigment, so it works best on dark hair against lighter skin and performs poorly on the pale, fine lanugo hair found in some congenital forms. Electrolysis is the usual alternative.
Can children be affected?
Yes. Congenital forms are present from birth by definition. Anything appearing in a child should be looked at by a GP, who can refer to a paediatric dermatology service if needed.
Does shaving make the hair grow back thicker?
No. Shaving cuts the shaft at a blunt angle, which feels coarser as it grows out, but it does not change the follicle or the rate of growth.
How fast does body hair grow back after removal?
Scalp hair grows at roughly 0.35 mm a day, about 1 cm a month, according to StatPearls. Body hair is slower and has a shorter growing phase, which is why waxed areas often stay clear for two to six weeks.
What is the bottom line on hypertrichosis?
Hypertrichosis is a hair excess condition, not a hair loss one, and the first useful step is working out which route it came from. Congenital forms are lifelong and managed cosmetically. Acquired forms often have a cause worth finding, whether that is a medicine, nutrition, local irritation or, rarely, something that needs investigating quickly. Hair removal is a free choice once the medical side is settled, and everyday conditioning simply makes dense hair easier to live with. Nothing sold on a shelf changes the underlying condition, and any page telling you otherwise is selling you something.
If dense or coarse hair is snapping when you brush it, a hair growth conditioner built around breakage defence is the sensible, unexciting place to start.
Sources and references
- DermNet: Hypertrichosis
- DermNet: Hirsutism
- NHS: Hirsutism
- NHS: Hair loss
- NHS: Polycystic ovary syndrome
- StatPearls: Physiology, Hair (NCBI Bookshelf)
Watermans products are 100% cosmetic and do not treat medical hair loss. Individual results may vary.
