Seborrheic Dermatitis or Eczema?
Seborrheic Dermatitis lesions sometimes look like Atopic Dermatitis / Eczema lesions. One reason is that The main reason why they can be similar is because the same commensal yeast lives off both Seborrheic Dermatitis and Eczema lesions. This yeast is called Malassezia or Pityrosporum.
Over time, some Seborrheic Dermatitis lesions around the ears may fissure and resemble the cracks you see in Eczema. Those around the upper back may erode and crust and show up like the erosions and crusts common in Eczema lesions.
The differences are most obvious in infants:
- Itch: In an infant, eczema is always itchy, and the child tends to be upset by the rash, with scratch marks being a common finding. Meanwhile, Seborrheic Dermatitis isn’t always itchy for infants.
- Area affected: Seborrheic Dermatitis may often spread to the diaper area in infants, while eczema in infant do not usually affect the buttocks.
You can learn more about TCM for Eczema here!
Seborrheic Dermatitis or Psoriasis?
In fact, Malassezia is also present in Psoriasis, making it sometimes very difficult to differentiate Seborrheic Dermatitis from Psoriasis.
Both Psoriasis in its nascent phase and Seborrheic Dermatitis may show up as greasy, scaly patches along the hairlines, around the ears, near the inner eyebrow.
That said, there are some ways to differentiate Psoriasis from Seborrheic Dermatitis:
- Look and feel: Once they develop beyond the nascent phase, Psoriasis lesions tend to show up as thicker, with a clearer border than Seborrheic Dermatitis lesions.
- Scales: Psoriasis scales are often less greasy, and drier.
- Auspitz sign: If you try to scratch or pluck off psoriasis scales, they will probably bleed and become thicker and itchier. On the other hand, SD patches are usually easy to remove with no bleeding.
- Colour: Psoriasis can appear as red or pink with silver-white scales, while the scales in SD tend to be more pinkish-yellow with yellowish flakes and a greasy appearance.
- Area affected: Psoriasis tends to extend beyond the hairline and usually affects more than one area of the body. If you have Scalp Psoriasis, you may have mild psoriasis on your elbows, knees or lower back too.
- Nail Changes: You are more likely to see nail pitting or dents in a mature Psoriasis presentation.
- Arthritis: About one-third of people with psoriasis get a form of arthritis as the disease gets worse. This pain can be classified as rheumatic pain and is also autoimmune in origin. Seborrheic Dermatitis is not an autoimmune skin condition.
When it is hard to differentiate both of them, there is also a medical label called Sebopsoriasis! For real!
Read up on TCM for Psoriasis here!
Seborrheic Dermatitis or Rosacea?
If a person presents only with Seborrheic Dermatitis of the Face, it can be difficult to differentiate from Rosacea.
- Color: Rosacea tends to present as blushing or flushing with visible blood vessels on the face, while Seborrheic Dermatitis typically appears as yellow greasy patches.
- Flushing: Rosacea most prominent characteristic is telangiectasia, which widening of the tiny blood vessels on the face. These dilated blood vessels cause threadlike red lines or patterns on the skin. Seborrheic Dermatitis does not present like this, and just appears as dull pink.
- Areas affected: Seborrheic Dermatitis often affects the forehead and eyelids, while Rosacea lesions usually start out at the sides of the nose and cheeks.
- Bumps: Rosacea lesions are also more ‘bumpy’ and ‘pimply’ compared to the flat and scaly lesions seen in Seborrheic Dermatitis.
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