What Causes Patches Of Hair Loss On Your Scalp?

Finding a bald patch on your scalp is unsettling, and the first question is almost always why. Patches of hair loss on the scalp are most often caused by alopecia areata, an autoimmune condition, or by a fungal infection called tinea capitis. Other common causes include a pulling hair disorder called trichotillomania, scarring skin conditions, and a form of permanent hair loss known as frontal fibrosing alopecia.

Each cause looks different under close inspection, and each behaves differently over time. Some patches regrow on their own. Others need treatment to stop the loss from spreading. A few are permanent if they are not addressed early. That is why the pattern, the skin underneath, and the speed of onset matter as much as the bald spot itself.

What Causes Patches Of Hair Loss On Your Scalp?

The cause depends on what is happening at the level of the hair follicle. In alopecia areata, the immune system mistakenly attacks the follicle, which is why the skin in the patch usually looks smooth and normal rather than red or scaly. In tinea capitis, a dermatophyte fungus infects the hair shaft and follicle, often producing scaling, broken hairs, and sometimes swelling.

In trichotillomania, the loss comes from repeated pulling, which leaves patches with hairs of uneven length. In scarring alopecias, inflammation destroys the follicle itself, and hair does not grow back once the follicle is gone. The distinction matters because the treatments are completely different, and using the wrong one wastes time.

Here is a plain comparison of the most common causes.

How Does Alopecia Areata Cause Round Bald Patches?

Alopecia areata is an autoimmune condition in which the body’s immune system targets the hair follicle. The follicle is not destroyed. It is pushed into a resting state, which is why the skin in the patch looks normal and the hair can return when the attack subsides.

The patches are usually round or oval and sharply defined. They can appear on the scalp, beard, eyebrows, or anywhere with hair. Some people notice a tingling or itching sensation before a patch appears, though many feel nothing at all. The condition affects people of all ages, but it often starts before age 30.

Alopecia areata is unpredictable. Some patches regrow within months without any treatment. Others spread or merge. A smaller number of people develop a more extensive form, including total loss of scalp hair (alopecia totalis) or loss of all body hair (alopecia universalis). Having one patch does not mean this will happen, but widespread disease is generally harder to treat.

There is a genetic component. People with a family history of alopecia areata, or with other autoimmune conditions such as thyroid disease or vitiligo, are more likely to develop it. It is not contagious.

Can A Fungal Infection Cause Bald Spots?

Yes. Tinea capitis is a fungal infection of the scalp that commonly causes patchy hair loss, especially in children. The fungus invades the hair shaft, making hairs brittle so they break off near the scalp. The result is a patch of stubble or baldness rather than a smooth bald spot.

The skin in the area usually looks scaly, and there may be redness or mild swelling. Some people develop swollen, pus-filled bumps called a kerion, which is an inflammatory reaction to the fungus. Enlarged lymph nodes in the neck can occur too. These signs point toward infection rather than an autoimmune cause.

Tinea capitis is treatable, but it requires prescription oral antifungal medication. Topical creams and shampoos alone are not enough to cure it because the fungus sits deep in the follicle. This is one reason an accurate diagnosis matters: a topical product that works for one condition will not clear the other. Tinea capitis is contagious and can spread through shared combs, hats, and close contact.

What Is Trichotillomania And How Does It Look Different?

Trichotillomania is a condition in which a person repeatedly pulls out their own hair. It is classified as a body-focused repetitive behavior. Many people do it without full awareness, often while reading, watching television, or lying in bed.

The patches from pulling look different from alopecia areata. They tend to have irregular, geometric, or odd shapes rather than clean circles. Within the patch, hairs are broken at different lengths because they were pulled at different times. The scalp itself usually looks normal, though there may be mild irritation.

Trichotillomania is not a habit a person can simply stop through willpower. It is a recognized condition, and treatment typically involves behavioral therapy, sometimes combined with medication. Hair regrows once the pulling stops, though repeated pulling over many years can cause lasting damage.

Which Types Of Hair Loss Leave Permanent Scarring?

Scarring alopecias are a group of conditions in which inflammation destroys the hair follicle. Once a follicle is destroyed, it does not regenerate, so the hair loss is permanent. The goal of treatment is to stop the inflammation and preserve the follicles that remain.

Frontal fibrosing alopecia is one example. It causes a slow, receding band of hair loss along the front of the scalp and sometimes the eyebrows. The skin in the affected area may look pale, shiny, and smooth because the follicles are gone. It is seen most often in women after menopause, though it can occur earlier.

Other scarring conditions include lichen planopilaris and central centrifugal cicatricial alopecia. These often cause itching, burning, or tenderness in the affected area, and the skin may look red or scaly around the edges of the bald patch. Because scarring is permanent, early evaluation matters. Treatment cannot bring back lost follicles, but it can slow or stop further loss.

When Should You See A Doctor About Scalp Hair Loss?

See a doctor if the patch is spreading, if the skin looks red, scaly, or swollen, or if you have pain, itching, or burning. These signs suggest an active process that may need treatment. Sudden shedding across the whole scalp, rather than a defined patch, points toward a different set of causes such as telogen effluvium, which often follows illness, major stress, or childbirth.

A dermatologist can usually tell the difference between these conditions by examining the scalp and, in some cases, using a dermoscope to look closely at the follicles. A small skin biopsy or a fungal culture may be needed when the diagnosis is unclear. Blood tests are sometimes ordered to check for thyroid problems or other conditions linked to hair loss.

Getting a clear diagnosis early is the single most useful step. The treatments for alopecia areata, tinea capitis, and scarring alopecia do not overlap. Guessing can delay the right care, and in scarring conditions, delay can mean permanent loss.

What Treatments Are Used For Patchy Scalp Hair Loss?

Treatment depends entirely on the cause. For alopecia areata, options include topical or injected corticosteroids, and for more extensive cases, oral medications that target specific immune pathways. Some people choose no treatment and monitor for regrowth, since mild cases often resolve on their own.

For tinea capitis, the standard treatment is oral antifungal medication, usually taken for several weeks. For trichotillomania, behavioral therapy is the main approach. For scarring alopecias, treatment focuses on controlling inflammation, often with anti-inflammatory medications.

It is worth being honest about what the evidence supports. Corticosteroid injections are widely used for limited alopecia areata and are supported by clinical experience and studies, but results vary. Newer oral treatments for severe alopecia areata have shown benefit in clinical trials, though they carry side effects and are not appropriate for everyone. No single treatment works for all cases.

Be cautious of products marketed for “hair regrowth” that do not name a specific condition. A supplement or shampoo that claims to fix patchy loss without addressing the underlying cause is unlikely to help. No clinical evidence currently confirms that these general products resolve alopecia areata, tinea capitis, or scarring alopecia.