Alopecia Areata: Patchy Hair Loss Explained

Alopecia areata is an autoimmune condition in which the immune system attacks hair follicles, usually causing smooth, round patches of hair loss. The follicles are not destroyed, so hair can regrow, and many people with a few small patches see regrowth within a year. The course is unpredictable, though, and assessment by a family doctor or dermatologist is the right first step.

What it looks like

The classic sign is one or more coin-sized bald patches on the scalp that appear over a few days or weeks. The skin in the patch usually looks normal, without scarring, scaling or redness. Some people notice mild tingling or itch beforehand, while others only find out when a hairdresser or family member points it out.

Short, broken hairs that are narrower at the base, sometimes called "exclamation mark" hairs, may be seen at the edge of a patch. Alopecia areata can also affect the beard, eyebrows, eyelashes and body hair. Fingernails may develop small pits or ridges.

Less commonly, the condition spreads to the whole scalp (alopecia totalis) or the entire body (alopecia universalis). Another pattern causes a band of loss around the sides and back of the head.

Why it happens

In alopecia areata, immune cells gather around the base of active hair follicles and push them out of the growing phase. The exact trigger is not fully understood. Genetics play a part, and the condition is more common in people with a personal or family history of other autoimmune or allergic conditions, such as thyroid disease, vitiligo, eczema, asthma or hay fever.

Stress is often mentioned as a trigger, and some people notice a link, but it is not considered the underlying cause. Alopecia areata is not contagious, not caused by anything you did and not a sign of poor hair care.

How it tends to behave

The course varies widely from person to person. Small, limited patches often regrow on their own, sometimes with fine white or pale hair at first that later regains its normal colour. New patches may appear as others recover.

Some people have a single episode, while others have repeated episodes over years. Features that tend to point to a more persistent course include extensive loss, onset in childhood, loss along the band at the back of the head, and nail changes. A specialist can help you understand your own outlook.

Getting a diagnosis

Your family doctor can often diagnose alopecia areata by looking at the scalp. Because other conditions can cause patchy loss, they may consider fungal infection, hair-pulling habits, traction from hairstyles, syphilis or scarring forms of alopecia. Blood tests, such as thyroid tests, may be suggested if there are other symptoms.

For extensive, rapidly spreading or persistent loss, a referral to a dermatologist is usually appropriate. Dermatologists have access to the full range of treatments, including newer prescription options for severe disease. Our article on medical causes of hair loss explains more about the tests doctors commonly consider.

Treatment options

There is no cure, but treatments can help hair regrow while they are being used. Choices depend on age, extent of loss and personal preference. Common approaches include:

• Watchful waiting for small patches, since many recover without treatment
• Corticosteroid injections into the patches, a common treatment for limited scalp involvement in adults
• Topical corticosteroids, often used in children or alongside other treatments
• Topical immunotherapy, offered by some dermatologists for more extensive loss
• Oral medications, including a newer class called JAK inhibitors, which a specialist may prescribe for severe cases

Minoxidil is sometimes used as an add-on. Platelet-rich plasma has been studied in small numbers of people with alopecia areata, but the evidence is limited, and it is not a standard treatment. Light therapy similarly lacks strong evidence for this condition, as discussed in our article on lasers and light therapy.

Risks and who should be cautious

Steroid injections can cause temporary pain, small dents in the skin at the injection site (which usually fill in over months), lightening of skin colour and, rarely, infection. They are used with caution in people with active scalp infection and may be avoided or adjusted during pregnancy.

Oral treatments for severe disease carry more significant risks, including effects on the immune system, and require specialist oversight and monitoring. Please do not start, stop or change any prescription treatment without speaking to the prescribing doctor.

The emotional side

Sudden, visible hair loss can be very distressing, and the uncertainty of the condition can be as hard as the hair loss itself. Feelings of anxiety, self-consciousness or low mood are common and deserve to be taken seriously.

Talking with your family doctor about how you are coping is part of good care. Some people find support groups, counselling, hairpieces, scarves, eyebrow techniques or simply connecting with others who have the condition helpful. Choosing not to pursue treatment is also a reasonable decision.

For children and teenagers, the condition can affect school and friendships. Speaking with teachers, keeping a regular routine and letting the young person have a say in whether to treat or cover patches can all help. Parents may also benefit from support, as watching a child go through hair loss can be stressful.

Frequently asked questions

Will my hair grow back?

Many people with limited patches see regrowth, often within a year, but it cannot be predicted for any one person. More extensive loss is less likely to recover fully without treatment.

Can alopecia areata come back after regrowth?

Yes. Recurrence is common, and new episodes can occur months or years later. This does not mean treatment failed; it reflects the nature of the condition.

Is alopecia areata linked to other health problems?

It is associated with a higher chance of some other autoimmune conditions, particularly thyroid disease. Your doctor may check for these if you have symptoms.

If you have noticed patchy hair loss, the first call is usually to your family doctor. HealthPark Medical Aesthetics is happy to discuss hair concerns in consultation and help you understand where you might best be cared for, which in many cases of alopecia areata will be with your doctor or a dermatologist.