What Causes Those Bumps on Our Scalp?
When you think about the health of your scalp, most of the time you're
probably focused on your hair. However, it turns out there's a lot going
on with the skin underneath your hair. So, in addition to frizziness or
hair loss, you could be facing dandruff or bumps on your scalp, too.
The good news is that if your scalp is healthy, you'll have a better
chance of growing healthy hair, according to evidence from the National
Institutes of Health. When the scalp is unhealthy, it can do the
opposite. When something in your scalp goes awry, it can lead to
uncomfortable rashes, bumps, flakes, sores, scabs and even hair loss.
The Anatomy of the Scalp
The skin on the scalp is different than that on the rest of the body:
Besides the obvious profusion of hair follicles, the scalp has more
sebaceous glands — tiny glands found in hair follicles (and some
hairless parts of the body as well) that release sebum, an oily
substance that acts as a lubricant for hair and skin. All of this makes
the scalp a particularly rich environment for microbes, which can bring
on various problems — including some that require medical attention.
If you're dealing with itchy, unsightly or just plain annoying scalp
issues, use the info below to help figure out if one of these common
scalp conditions could be the root cause. Once you know what's going on,
you can better treat the underlying condition.
Since it's nearly impossible to get a good look at the top or back of your own head, it's a great idea to have a board-certified dermatologist examine your scalp and come up with a treatment plan to help you find relief.
Head Lice
These tiny insects live in the hair on people's heads (including
eyebrows and eyelashes!) and feed on human blood. While they don't
spread any diseases and they can't jump or fly, lice can crawl from one
person to another if they touch, according to the Centers for Disease
Control and Prevention (CDC). When a person is allergic to a lice bite,
it can itch.
What it looks like:
Lice eggs (nits) are usually attached to the hair shaft and may be confused with scabs or dandruff flakes. Adult lice are about the size of a sesame seed and tan or gray in color; they may appear darker on darker hair. There may be sores on the scalp if the person has been scratching.
The causes: Usually lice are spread when one person's head touches
another person's. Young kids are the biggest culprits, but it's
important to note that a lice infestation does not mean a person is
dirty.
It's also possible — but not likely — to get lice from shared items like
clothes, pillows or combs.
The treatments: Head lice can usually be taken care of with an OTC
shampoo treatment and a lice comb.
If that doesn't work, a doctor can prescribe additional medications. You
should also vacuum, wash the infected person's clothes and bedding and
disinfect their combs and brushes, according to the CDC.
Lichen Planus
Lichen planus (LP) is an inflammatory disorder that affects the skin and
mucus membranes. Research shows it's common and can show up nearly
anywhere on the body. This includes the mouth, genitals, nails, legs and
the scalp (just to name a few spots!).
What it looks like:
LP usually appears as small purple or red irritated bumps on the scalp and in some cases, it can cause hair loss. On other parts of the body, it may manifest in a different way, according to the American Academy of Dermatology (AAD).
The causes: No one is exactly sure what causes a person to develop LP, but the AAD says these are some likely triggers:
1. In rare instances, metal dental fillings have been linked with LP.
2. People with Hepatitis C are more likely to have LP.
3. Certain medications seem to spark the development of LP so tell your dermatologist about everything that you take.
4. Genetics may also come into play — one particular type of LP called bullous lichen planus tends to run in families.
The treatments:
1.Topicals like corticosteroid, retinoic acid, tacrolimus ointment and pimecrolimus cream can be applied to skin where there are LP lesions.
2. Antihistamines and retinoic acid can be taken in pill form.
3. Using PUVA therapy, patients either soak parts of their skin in water
that contains psoralens (plant compounds that make skin more sensitive
to UVA rays) or they take psoralens orally. Then, affected skin is
exposed to ultraviolet A (UVA) light.
Seborrheic Dermatitis (Dandruff)
Seb derm, as most dermatologists call it, is one of the most common
scalp conditions. In babies, it's called cradle cap; in adults, it
causes red, itchy patches with greasy scales or flakes. People usually
refer to it as dandruff when it's on the scalp, but seb derm when it
affects the face, nose, eyebrows, ears or chest. Research estimates that
half of all adults in the world have dandruff so if you're struggling
with it you're definitely not alone. Seb derm often comes and goes with
triggers such as stress and seasonal changes — it is usually worse in
winter and early spring. It's often best to treat seborrheic dermatitis
early and aggressively to avoid complications such as hair loss.
What it looks like:
Greasy scales and dandruff flakes
The causes:
1. A yeast (fungus) called malassezia, which is in the oil secretion on the skin, is thought to be the culprit, though doctors don't know for sure.
2. Parkinson's disease, depression, diabetes, a weakened immune system and obesity may make a person more likely to have seb derm. So can recovering from a stressful health event, like a heart attack.
3. Dry skin can result in flakes as can a sensitivity to certain hair products so it's helpful to look at your scalp care regimen to see if something other than a fungus is causing your flakes.
The treatments:
1. A prescription strength anti-yeast shampoo called ketoconazole can help. Since it can be very drying to the hair, applying the shampoo directly to your scalp 5 to 10 minutes before wetting the hair and then lathering only the scalp area before you rinse it off is recommended. Following with a moisturizing shampoo and conditioner on the hair shaft can prevent the dryness that prescription shampoos can often cause, especially in more coily hair types.
2. OTC shampoos or lotions that contain zinc pyrithione, ketoconazole or sulfur may also help.
3. A topical steroid may be prescribed if the shampoo doesn't work, or in combination with the shampoo if the scales are very dense.
Psoriasis
This condition affects about 1 to 2% of the general population and
anyone can get it, at any age. Psoriasis can appear on any part of the
body, but according to the National Psoriasis Foundation, as many as 45%
to 56% of those with psoriasis have it on their scalp. And that kind is
one of the most difficult types to treat. One way to distinguish it
from dandruff: The buildup of skin cells creates scaly patches that are
dry, rather than oily. And those patches can itch, hurt, crust up and
bleed.
What it looks like:
Pink plaques with a silvery scale. On darker skin tones, the plaques may
be dark red or purplish.
The causes: 1. Psoriasis is thought to be an immune dysregulation around
skin cells that causes the cells in the top layer of skin to go into
overdrive.
2. Stress can make the situation worse, because it causes an increase in
the hormone cortisol, which in turn can boost inflammation.
The treatments:
1. Topical steroids, which control the inflammatory response, are the most common treatment.
2. Injections called biologics that help suppress what's causing the flare-ups in tougher cases.
3. An excimer laser can work on individual spots that haven't responded to other therapies.
4. A gentler hair routine can also help. Not shampooing your hair every day may lessen the number of skin rashes, or a therapeutic oil cream can do wonders.
Folliculitis 
Folliculitis, a common skin condition, is basically inflammation of the
hair follicle; it appears as little pus bumps scattered throughout the
scalp that look similar to acne and can spread. The bumps can sometimes
feel sore.
What it looks like:
Scattered pus bumps. On darker skin tones, the bumps may be a dark shade of red or light purple around the periphery.
The causes:
1. Bacteria (most commonly a staph infection) or a fungal infection.
2. Irritation from shaving, heavy conditioners, potent hair dyes and excessive sweating.
The treatments:
1. Topical or oral antibiotics may be prescribed if your doctor determines via a culture that bacteria is causing your scalp woes.
2. Anti-inflammatory medications, such as topical steroid formulations, can be effective if there isn't an infectious agent present.
Hair Loss
Hair loss can be due to a number of different factors, including
genetics, medications, inflammation, hormonal abnormalities and hair
fragility. Regardless of the cause of hair loss, it can be extremely
distressing. If you notice your hair breaking or shedding, or you see
bald spots on your scalp, make an appointment to get evaluated by a
health care provider immediately.
What it looks like:
Anything from hair breaking or shedding, to bald spots on your scalp.
The causes:
1. Anemia, vitamin deficiency, thyroid abnormalities, irregular hormone levels (especially after pregnancy) and autoimmune markers can all lead to hair loss.
2. Extreme stress, such as the death of a loved one, can have an impact on your whole body including your hair.
3. Major weight loss (sometimes related to a high-protein diet) can also trigger hair loss.
4. Infection and illness can cause a massive shedding months after the incident — a condition called telogen effluvium. For instance, a survey conducted by Survivor Corps found that nearly 68% of 1,700 COVID-19 survivors that were interviewed reported experiencing hair loss in the wake of their coronavirus infection.
Age can also play a role: As estrogen levels decrease between
childbearing age and menopause, our hair may thin out. Years of
bleaching, dyeing, straightening, perming and rocking tight,
slicked-back hairstyles can also catch up to us.
The treatments:
1. Rogaine, a solution that thickens existing hair, and spironolactone, a pill that helps block hormones called androgens, can be helpful in cases of hormonal thinning.
2. Eating a well-balanced diet is also useful when experiencing hair health woes, and talking to your doctor about whether you're deficient in iron or specific vitamins.
3. Taking a break from over-processing your hair and wearing more natural styles is recommended.
4. Platelet-rich plasma (PRP) is an effective option for androgenetic
alopecia (also called male and female pattern hair loss) and the
residual thinning after telogen effluvium. During PRP, a patient's blood
is drawn and the plasma, which is rich in various growth factors
effective for stimulating hair regrowth, is isolated and injected or
applied to the scalp with microneedling.
Cysts
Cysts can occur on the skin, just like they can show up on other organs.
The good news: Scalp cysts are common and easy to identify. They are
usually bumps the size of marbles or grapes, and you can feel them when
your comb or brush runs over them. If you're unsure about a bump or you
can't get a good look at your scalp, that's a smart time to consult a
dermatologist.
What it looks like:
A skin-colored or pink-red smooth bump
The cause: For the most part, scalp cysts are mostly genetic.
The treatments:
1. Leave them alone. This is definitely an easy option if the scalp cysts aren't bothering you, since they are mostly benign and shouldn't raise any concern.
2. Have them drained: In some cases, however, scalp cysts can get infected or irritated, which causes pain. Incision and drainage can help calm the symptoms, but won't remove the cyst in its entirety.
3. Consider antibiotics: These can also help relieve symptoms of an inflamed or infected cyst.
4. Have them surgically removed by a medical professional. Cysts contain
a fluid-filled sac. Unless the sac is removed, the cyst can recur, thus
surgery is the only effective option to completely remove a cyst and
make sure it doesn't recur. But the surgical removal is very simple and
done with just a local anesthetic. While it does leave a scar, it's
often not noticeable on the scalp since it's hidden by hair.
Ringworm
Also called tinea capitis, ringworm is a contagious fungal infection that usually happens in little kids, but occasionally infects adults too. Despite the name, no worm is involved: The condition got its name from its circular shape. The rash is usually painful and scaly and sometimes causes enlarged lymph nodes. It also can lead to bald spots, broken hairs and black dots on the skin.
What it looks like:
Scaly rash and bald spots
The cause: According to the Mayo Clinic, ringworm can be spread human to
human, animal to human (cats are a common source) and object (like
clothing, towels, bedding, combs and brushes) to human. Ringworm can
also be transferred by indirect contact through a swimming pool or hot
tub.
The treatment: Antifungal medication taken daily for 4 to 6 weeks
usually eliminates ringworm. Ringworm is no longer contagious 48 hours
after starting treatment. Until then, you want to avoid contact with
others, as tinea capitis can spread through contact with other areas of
the body and other people.
Allergic Contact Dermatitis (ACD)
This rash is a reaction to the scalp coming into direct contact with an
allergen that results in a response from the immune system — sometimes
days after the contact, so it can be difficult to determine what the
body is reacting to. ACD can be painful, itchy and even oozing in some
cases. The symptoms of a severe case can often be mistaken for
infection.
What it looks like:
Itchy redness. On darker skin tones, it may look pink, grayish or
purple.
The causes:
1. Paraphenylenediamine (PPD) is a chemical that is widely used as a permanent hair dye and it can wreak havoc on the skin and is one of the most common causes of scalp allergic contact dermatitis.
2. The chemicals/fragrances in shampoos and conditioners are also a common cause of ACD.
3. Other relevant possible allergens include propylene glycol, Cocamidopropyl betaine, methylisothiazolinone (MI) or a combined formulation of methylchloroisothiazolinone and MI.
The treatments:
1. Identifying the trigger and eliminating it. As stated, that can be difficult to determine; sometimes a patch test is needed to figure out what the body is allergic to.
2. Topical steroid gel, foam, cream or ointment: Two to three weeks of treatment should help decrease inflammation and clear up your skin.
3. Systemic steroids may be prescribed in severe cases - consult your
doctor.
In Conclusion...
Understanding the various conditions that can affect your scalp is an important step toward maintaining both scalp and hair health. From common issues like dandruff and folliculitis to more complex conditions such as psoriasis and lichen planus, each scalp condition has distinct characteristics, causes, and treatment options. The key to effective management lies in proper identification and timely intervention.
While some scalp conditions can be treated with over-the-counter products and lifestyle modifications, others require professional medical attention and prescription treatments. If you're experiencing persistent itching, unusual bumps, significant flaking, hair loss, or any other concerning symptoms, don't hesitate to consult a board-certified dermatologist. Early diagnosis and treatment can prevent complications and often lead to better outcomes.
Remember that a healthy scalp is the foundation for healthy hair growth. Simple practices like maintaining good hygiene, avoiding harsh chemicals when possible, managing stress levels, and being mindful of potential allergens in your hair care products can go a long way in preventing many scalp issues. Additionally, if you notice any changes in your scalp health or if symptoms persist despite treatment, seeking professional evaluation is always the wisest course of action.
Your scalp deserves the same attention and care as the rest of your
skin. By staying informed about these common conditions and their
treatments, you're better equipped to recognize problems early and take
appropriate action. Whether dealing with a minor irritation or a more
serious condition, proper care and medical guidance can help restore
your scalp to optimal health.