Eczema and psoriasis are two prevalent chronic skin conditions, both characterised by inflammation, irritation, and significant discomfort. Because both conditions present with red, inflamed, and often itchy skin, they are frequently confused with one another.
However, while they share superficial similarities, they are fundamentally different conditions. Understanding the difference between psoriasis and eczema is crucial, as an accurate diagnosis will inform the most appropriate course of treatment and can help you manage your condition long term. This article will dive into the differences between these conditions, helping you better understand your skin.
What is Psoriasis?
Psoriasis is defined as a chronic autoimmune disorder that dramatically accelerates the life cycle of skin cells. Normally, skin cells take weeks to mature and shed; in a person with psoriasis, this process is sped up to just a few days. This accelerated production leads to a rapid build-up of skin cells on the surface, forming thick, scaly patches known as plaques.
The most prevalent form is plaque psoriasis, but other forms include guttate, inverse, pustular, and erythrodermic psoriasis, all presenting with varying symptoms and severity.
What Causes Psoriasis?
Psoriasis is an autoimmune condition. This means the body’s immune system, specifically T-cells, mistakenly attacks healthy skin cells. This misguided attack triggers the rapid skin cell production that results in plaques.
A family history can increase the risk of developing the condition. However, psoriasis flares are often triggered by external or internal stressors that provoke the immune system’s response. Common triggers that can initiate or worsen a flare-up include:
- Infections: Such as strep throat, which can trigger guttate psoriasis.
- Skin Injuries: Cuts, scrapes, or severe sunburns (known as the Koebner phenomenon).
- Stress and Hormonal Fluctuations: Emotional stress or hormonal changes can prompt a flare.
- Certain Medications: Beta-blockers or lithium, among others.
What Does Psoriasis Look Like?
Psoriasis often presents with characteristic plaques, which are raised, noticeably thick, and inflamed patches with distinct, silvery-white scales. These plaques tend to appear in symmetrical patterns. Unlike the intense itching of eczema, the symptoms are often described as burning or stinging sensations.
Common locations include the outer surfaces (extensor surfaces) of the skin, such as the:
- Elbows
- Knees
- Lower back
- Scalp
Treatment Options for Psoriasis
Psoriasis treatment generally aims to slow down the skin cell growth cycle and manage inflammation. These include:
- Topical Treatments: These are often the first line of defence for mild to moderate cases. They include corticosteroid creams to reduce inflammation and vitamin D analogues to help normalise skin cell turnover.
- Light Therapy (Phototherapy): For moderate to severe psoriasis, controlled exposure to ultraviolet (UV) light can help slow the overproduction of skin cells and reduce inflammation.
What is Eczema?
Eczema is a chronic inflammatory skin disorder. Unlike psoriasis, it is not classified as an autoimmune condition but stems from a compromised skin barrier and a hypersensitive immune response. The damaged skin barrier allows moisture to escape and irritants/allergens to enter more easily, leading to inflammation. Eczema is also often associated with other allergic conditions, forming the “atopic triad” with hay fever and asthma.
There are different types of eczema with different triggers. You can have more than one type of eczema at the same time.
- Atopic dermatitis
- Contact dermatitis
- Dyshidrotic eczema
- Neurodermatitis
- Nummular eczema
- Seborrheic dermatitis
What Causes Eczema?
There are several interconnected factors that contribute to the development of eczema, including:
- Genetic Predisposition: A family history of atopic conditions significantly increases risk.
- Compromised Skin Barrier: Defects in the protein filaggrin lead to a dysfunctional barrier.
- Allergens: Triggers include environmental factors like dust mites, pet dander, and pollen.
- Irritants: Harsh soaps, detergents, fragrances, and certain fabrics.
- Food Sensitivities: Certain foods can sometimes be triggers, particularly in children.
- Climate: Dry, cold weather and excessive heat/humidity, which can lead to sweating, can both trigger flare-ups by dehydrating or irritating the skin.
- Stress: Emotional stress can trigger hormonal shifts that worsen inflammation and exacerbate eczema symptoms.
What Does Eczema Look Like?
Eczema lesions typically present as red, inflamed patches with less distinct or diffuse borders. The affected areas often appear dry, cracked, and sometimes weeping. The primary symptom is severe, persistent, and often sleep-disrupting itching, sometimes accompanied by blisters.
Eczema generally occurs in flexural areas (skin folds) where the skin rubs together and sweats, such as:
- Backs of the knees
- Ankles
- Feet
- Neck
- Insides of the elbows
- Behind the ears
- Face (especially the cheeks)
Treatment Options for Eczema
The focus of eczema treatment is on repairing the skin barrier and controlling inflammation through:
- Topical Treatments: Similar to psoriasis, corticosteroid creams are used to manage flare-ups. Emollients and moisturisers also play a critical role in repairing the skin barrier and moisturising the skin for healing.
- Laser Therapy: For persistent redness and inflammation, laser treatments could be a beneficial option. For instance, V Beam laser treatment to target blood vessels and manage the redness associated with eczema.
Difference Between Eczema and Psoriasis
While they look similar, their distinct characteristics are key to proper diagnosis; the following factors can help determine which condition you have:
Appearance and Location
- Psoriasis: Presents as thick, well-defined, silvery plaques on extensor surfaces (outside of joints like elbows and knees).
- Eczema: Presents as diffuse, red irritation, often raw or weeping, primarily in flexural areas (creases of elbows and knees).
Itching and Discomfort
- Psoriasis: Patients typically report milder burning, stinging, or generalised soreness.
- Eczema: Characterised by intense, severe, and persistent itching that disrupts sleep.
Age of Onset
- Psoriasis: Typically starts later, in the late teens to mid-thirties.
- Eczema: Often begins in infancy.
Underlying Mechanisms
- Psoriasis: The fundamental cause is an autoimmune disorder that accelerates skin cell turnover.
- Eczema: Stems from a primary compromise of the skin barrier and a resulting hypersensitivity/allergic reaction.
Family History and Genetic Factors
Both conditions have strong hereditary components, but psoriasis is often linked to other systemic autoimmune disorders, while eczema is more closely tied to allergic conditions.
Get Professional Care for Your Skin
Understanding the nuances of eczema vs psoriasis is the first step, but professional guidance is essential. The symptoms can be ambiguous in some individuals, making accurate identification challenging.
A thorough clinical examination by an eczema specialist is the first step toward the correct diagnosis and effective management of your discomfort. While a definitive diagnosis is usually clinical, a skin biopsy may be used when symptoms are ambiguous. For eczema, a specialist might also use tools like allergy testing to identify specific external triggers.
If you are struggling to manage your symptoms or are uncertain about whether you have eczema or psoriasis, don’t let chronic irritation control your life. Book a consultation with Dr Gerard Ee for a professional assessment and start your journey towards clearer, calmer skin.
