That red, itchy rash on your scalp that has flaky scales could be seborrheic dermatitis, or seborrhea. It's a common skin disease that looks similar to psoriasis, eczema, or an allergic reaction. And it can appear on your body as well as your scalp.
We don't know what exactly causes seborrheic dermatitis. It seems to be a combination of things, including:
- Your genes
- A yeast that normally lives on skin
- Certain medical conditions and medicines
- Cold, dry weather
It doesn't come from an allergy or being unclean.
Newborns and adults aged 30-60 are more likely to get seborrheic dermatitis. It's more common in men than women and in people with oily skin. These medical conditions can also raise your risk:
Dandruff and cradle cap are common names for seborrheic dermatitis. Babies 3 months and younger often get cradle cap: crusty yellow or brown scales on their scalp. It usually goes away before they're a year old, although it can come back when they reach puberty.
You might get seborrheic dermatitis on your face, especially around your nose, on your eyelids, or behind your ears. It can show up on your body, too:
- In the middle part of the chest
- Around the navel
- On buttocks
- In skin folds under arms and on legs
- In the groin
- Below breasts
Skin can itch, burn, or look red. The scales that flake off could be white or yellowish and look moist or oily.
Because it can look like other skin conditions, you should see your family doctor to get a diagnosis and the right treatment. The dermatologist will ask about your medical history and look at your skin. You may need other tests if the doctor thinks it's related to another medical condition.
Sometimes, seborrheic dermatitis will clear up by itself. More often, it's a lifelong issue that clears and flares. It can last for years at a time, but you can usually control it with good skin care.