A bald spot on the side of your head most likely falls into one of a few categories: an autoimmune condition called alopecia areata, hair loss from repeated tension on the hair (traction alopecia), or a fungal scalp infection. Less commonly, it could signal a scarring condition that permanently destroys hair follicles. The cause matters because some of these resolve on their own, some need treatment to prevent progression, and some lead to permanent loss if ignored.
Alopecia Areata: The Most Common Cause
Alopecia areata is a condition where your immune system mistakenly attacks your own hair follicles, causing hair to fall out in smooth, round patches roughly the size of a quarter. It affects about 2% of people worldwide, and it can strike at any age. The patches typically appear suddenly, sometimes seemingly overnight, and the bare skin underneath usually looks normal with no redness, rash, or scarring.
One telltale sign is the presence of “exclamation point” hairs around the edges of the patch. These are short, broken hairs that are wider at the tip and narrower where they meet the scalp, giving them the look of a tiny exclamation mark. If you look closely at the border of your bald spot and see these stubby, tapered hairs, alopecia areata is a strong possibility.
The good news is that the hair follicles aren’t destroyed. Spontaneous regrowth occurs in 50% to 80% of people in certain subgroups, often without any treatment at all. But the course is genuinely unpredictable. Some people have a single episode and never deal with it again. Others see patches come and go over years, and in some cases multiple patches merge into larger areas of loss. There’s no way to predict which path yours will take, which is one reason getting a professional evaluation early is worthwhile.
Traction Alopecia: Hair Loss From Tension
If your bald spot sits along your hairline or the temple area on the side of your head, the culprit may be your hairstyle. Traction alopecia develops when hair is pulled tight in the same direction repeatedly over months or years. The most common offenders are tight ponytails, cornrows, braids, buns, weaves, and hair extensions. The sides of the head, particularly the frontal and temporoparietal areas (basically your temples and the area just above and behind your ears), are the zones most frequently affected.
This type of hair loss is especially well documented in women of African descent who wear braids or cornrows, and in Hispanic women who wear tight ponytails for long periods. But it’s not limited to any one group. Ballerinas, athletes who pull their hair back daily, and even nurses in countries where tight-fitting caps are secured with bobby pins for eight-hour shifts have developed it. One study of 143 South Korean nurses found that seven developed localized hair loss at the exact spot where their caps were pinned, after an average of nearly 10 years of daily wear.
The critical thing about traction alopecia is timing. Caught early, the hair can regrow once the tension stops. Left too long, the repeated stress destroys the follicles permanently. If you notice thinning or a bare patch where your hair gets pulled the tightest, switching to a looser style now can make the difference between temporary and permanent loss.
Fungal Scalp Infection (Tinea Capitis)
A fungal infection of the scalp, commonly called ringworm, can also create a distinct bald patch. Unlike alopecia areata, a fungal infection almost always comes with visible changes to the skin. You’ll typically see scaling, redness, or flaking within the patch. The hair doesn’t fall out cleanly. Instead, it breaks off at the scalp surface, sometimes leaving behind tiny dark stubs known as “black dots” scattered across the bare area. This appearance is distinct enough that doctors call it “black dot ringworm.”
Some fungal infections stay mild, causing itching and flaky patches that can look like dandruff. Others become intensely inflamed, forming a swollen, tender, boggy mass on the scalp that may ooze pus. This severe form, called a kerion, can cause pain, fever, and swollen lymph nodes in the neck. It’s more common in rural areas and in people who have regular contact with animals. Without treatment, inflammatory fungal infections can scar the scalp and cause permanent hair loss.
If your bald spot is itchy, flaky, red, or painful, a fungal infection is high on the list of possibilities and needs treatment with antifungal medication to clear.
Scarring vs. Non-Scarring Hair Loss
The most important distinction a dermatologist will make is whether your hair follicles are still intact or have been permanently destroyed. In non-scarring hair loss (like alopecia areata or early traction alopecia), the follicles are preserved beneath the skin. The oil glands around the follicles remain in place, and regrowth is possible.
In scarring hair loss, the follicles are irreversibly destroyed. The stem cells that generate new hair are wiped out and replaced by scar tissue. The scalp in these areas may look shiny, smooth, or slightly discolored, and you won’t see any fine hairs or follicle openings. Inflammatory cells are typically found surrounding the follicles in biopsy samples, which is why many scarring conditions involve redness, tenderness, or a burning sensation at the edges of the patch where the process is still active. Catching a scarring condition early can save the remaining follicles, even if the ones already lost won’t come back.
How Doctors Diagnose a Bald Spot
A dermatologist can often identify the cause just by looking at the patch and the skin around it. But they have several tools to confirm the diagnosis when things aren’t obvious.
- Hair pull test: The doctor grasps about 50 to 60 hairs between their fingers and gives a gentle tug. If more than five or six hairs come out easily, it signals active, ongoing hair loss.
- Trichoscopy: A handheld magnifying device (essentially a specialized dermatoscope) lets the doctor examine the scalp surface and hair shafts up close without any cutting or scraping. It can reveal exclamation point hairs, black dots, comma-shaped hairs from fungal infection, or the loss of follicle openings seen in scarring conditions.
- Scalp biopsy: For uncertain cases, a small 4-millimeter punch of skin is taken from the active edge of the patch. This is examined under a microscope to determine whether follicles are intact or destroyed, and whether inflammation or infection is present.
Most bald spots can be diagnosed with just a visual exam and trichoscopy. Biopsy is reserved for cases where the cause remains unclear or scarring is suspected.
Treatment and Regrowth Expectations
Treatment depends entirely on the cause. For alopecia areata, the most common approach for a single patch is a series of steroid injections directly into the bald spot, repeated every four to six weeks. Studies consistently show regrowth rates between 62% and 97% with this method. In one study, 62% of patients showed regrowth after just three monthly sessions, compared to only 7% of those who received a placebo injection. An uncontrolled study from Saudi Arabia found 63% of patients achieved complete regrowth with monthly injections. Your dermatologist may also offer topical treatments for milder or smaller patches, particularly in children or people who prefer to avoid needles.
For traction alopecia, the treatment is straightforward: stop the tension. Switch to looser hairstyles, avoid tight elastics, and give your hairline time to recover. If follicles haven’t been permanently damaged, regrowth usually follows over several months.
Fungal infections require antifungal medication taken by mouth, since topical creams alone can’t penetrate the hair shaft where the fungus lives. Treatment typically runs several weeks, and the infection needs to be fully cleared before healthy hair can regrow.
For scarring conditions, the goal shifts from regrowth to stopping the process. Anti-inflammatory treatments can halt further follicle destruction, preserving what you have. Hair that’s already gone from scarred areas won’t return on its own, though surgical options like hair transplantation may be considered later for cosmetic restoration.
What the Spot Looks Like Tells You a Lot
You can narrow down the likely cause before you ever see a doctor by paying attention to a few details. A smooth, skin-colored patch with no redness or flaking, possibly with a few short tapered hairs at the edge, points toward alopecia areata. A patch along your hairline or temple that corresponds to where your hair gets pulled tightest suggests traction alopecia. A scaly, red, or itchy patch with broken-off hair stubs is consistent with a fungal infection. And a shiny, smooth patch where you can’t see any follicle openings at all raises concern for scarring hair loss.
Regardless of the cause, a bald spot that’s getting larger, spreading to new areas, or accompanied by pain, pus, or burning warrants prompt evaluation. The sooner you identify what’s happening, the more options you have to protect your hair and encourage regrowth.