Dandruff: we all know it. It’s the itchy, flaky skin that can appear on your scalp, often making its way onto your clothes. But can bald people have dandruff? It seems counterintuitive to imagine flakes on a hairless head.
The truth is, it’s probably not dandruff at all, and it may be another skin condition.
What causes dandruff?
Dandruff is caused by a combination of factors. First, you need the presence of a fungus called Malassezia globosa. This fungus eats sebum, the oil your scalp naturally produces. But not everyone reacts the same way to Malassezia; some people’s scalps are more sensitive than others.
Having hair helps the fungus thrive. Hair creates a warm, dark, humid environment that Malassezia loves.
It’s important to know that dandruff isn’t caused by poor hygiene. You can wash your hair every day and still have dandruff.
Why bald heads are less prone to dandruff
Dandruff is less common in bald people because the environment on a bald head isn’t as friendly to the Malassezia globosa yeast that causes dandruff.
Lack of ideal environment
Hair provides a darker, more humid environment that yeast enjoys. Bald heads, on the other hand, are cooler — typically 2 to 4℃ cooler — and drier.
Exposure to the elements
Bald scalps are more exposed to air and sunlight, which can lower the humidity and potentially keep fungal growth at bay.
When it’s not dandruff: Alternative explanations for flaking
If you’re seeing flakes on your bald head, it could be dandruff, but it could also be something else.
Dry skin (xerosis)
The most common cause of flaking on bald heads is dry skin. When your scalp lacks moisture, it sheds skin cells, and you see those cells as flakes. Harsh soaps, cold weather, and low humidity can all make dry skin worse. Usually, dry skin flakes are smaller and whiter than dandruff flakes.
Psoriasis
Psoriasis is an autoimmune condition that causes skin cells to multiply too quickly. Even on a bald head, psoriasis can cause flaking. Psoriasis often shows up as thicker, silvery scales, along with inflammation.
Other conditions
Eczema, also known as atopic dermatitis, can also cause flaking and itching on the scalp. In addition, an allergic reaction to a hair product or sunscreen might lead to flaking.
Key Takeaways
Remember, those flakes on a bald head usually aren’t dandruff. It’s important to get the right diagnosis so you can use the right treatments.
If over-the-counter lotions don’t help, see a dermatologist. No matter what, make sure you moisturize your scalp and protect it from the sun to keep it healthy.