Psoriasis vs Fungal Infection: How They Differ?

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When a red, flaky, and itchy rash pops up, it is normal to worry. Most of us instantly guess it is a common fungus like ringworm. You might buy a drugstore antifungal cream and use it every single day. But what if weeks pass, the cream is empty, and the rash is only getting thicker and angrier? 

You might actually be dealing with psoriasis, an internal immune condition.

While both cause red, itchy skin, they are completely different issues. Treating psoriasis with a simple fungus will fail and actually make your skin worse. 

Quick Comparison Table

Borders, scale, and shape

If you look closely at the rash, its shape gives you a very clear clue about what is actually happening.

Fungal Infection

A fungus like a ringworm grows in circles. The outer edge is bright red, bumpy, and flaky. But the inside center slowly clears up completely. It looks just like a drawn ring. The flaking on top is very light and powdery.

Psoriasis

It does not form hollow rings. Instead, it builds into a solid, heavy, raised block that is thick and red from edge to edge. On top, you will see a heavy buildup of thick, silvery scales stuck together tightly. If you try to peel these thick scales off, the raw skin underneath will instantly bleed in tiny dots.

Common Body Areas

Fungus and psoriasis have different spots on your body where they can grow, which is a major difference between the two.

Fungal Infections

Fungi are like wild mushrooms that like warm, dark, and very damp environments. It usually occurs on the following common body areas:

• Between toes, bottom of the foot, and soles; you get peeling, cracking, or itching.
• Groin and inner thighs become itchy, with reddish-brown rashes.
• Torso, limbs, or face become raised; clay-colored borders and clear centers show up on exposed skin.
• Moist skin folds like armpits, under the breasts, or the deeper area can become red and moist.
• Toenails or fingernails become yellow, white, thick, or brittle.

Psoriasis 

• The outer sides of joints, like elbows and knees.
• Scalp, hairline, and behind the ears.
• The trunk and lower back.
• Skin folds, such as armpits, groin, under the breasts, and belly button.
• Palms of the hands and soles of the feet.
• Pitting, oil spots, or nail bed separation on fingernails or toenails.

Spread and Contagiousness

Fungal Infection

Fungal infections such as ringworm, athlete's foot, or jock itch are highly contagious. They can spread very easily through direct skin-to-skin contact, contact with infected animals, or through shared spaces such as gym floors, locker rooms, or shared towels and damp clothing. This happens because the environmental or body fungi grow in warm and humid conditions and can be transferred from person to person.

Psoriaisis

Psoriasis is not contagious. You cannot catch it from another person through hugs, shared meals, or even in shared spaces. It does not spread from person to person or from one body part to another simply by handshake. However, new patches of psoriasis can develop on areas of skin if one experiences skin injury, has tooth loss or piercing, stress, or bad food intake. It does not spread because it is driven by genetics and an overactive immune system that speeds up skin cell growth rather than an external germ.

Risk Factors For Fungal Infection

There are certain risk factors for fungal infection discussed below:

Poor hygiene and damp clothing: When you stay in damp clothes such as gym wear, wet swimsuits, and tight, non-breathable fabrics, it traps moisture against the skin

Public shared spaces: Walking barefoot or sharing towels, shoes, and gym gear in shared spaces such as public shoes, pools, or locker rooms also causes ringworm.

Warm and humid conditions: Fungal infection is usually caused in heat and moisture, making skin folds, feet, and the groin the most common targets.

Certain health conditions: If someone is suffering from diabetes, chronic lung disease, skin disease, or has a weak immune system, then the risk of fungal infection increases.

Medications: Certain medicines can also cause fungal infection in an individual.

How Doctors Test

A doctor will do a physical examination to check the symptoms of both fungal infections and psoriasis. He will also ask questions related to your medical or family history. A skin biopsy test (a small skin sample is taken to check under a microscope) is done if the diagnosis is unclear. The doctor will do a dermoscopy using a magnifying tool to look closely at the skin pattern. 

A KOH prep test is also done to confirm fungal infection by the doctor, in which he gently scrapes a small amount of scale from the edge of the rash onto a glass slide, adds a drop of potassium hydroxide solution, and examines it under a microscope. If the diagnosis for fungus is still unclear, the doctor may send a scraping to a lab for a fungal culture, which is grown on a special medium to check if it is from an animal source or a nail or scalp infection.

Along with the doctor's test, an Ayurvedic practitioner will do your Nadi Pariksha to check which of the internal energies ( Vata, Pitta, and Kapha) is imbalanced. He will also ask you questions related to your lifestyle and food habits, because they play a major role. 

Why Steroid-Only Self-Treatment Can Be Risky

Many people try to fix a sudden rash by grabbing old steroid creams from their bathroom cabinet. If you have psoriasis, a mild steroid might temporarily calm the redness. But if you actually have a fungal infection, using a steroid cream creates a total disaster. Steroids work by putting your local immune system to sleep. Without your skin's natural defenses fighting back, the fungus goes completely wild. It spreads rapidly, changing its shape so much that doctors struggle to recognize it.

When To Seek Care 

Stop trying to treat the rash at home and see a professional immediately if your skin gets out of control.

• A basic drugstore antifungal cream has not worked after two weeks
• The red patches are quickly spreading, multiplying, or joining together.
• The skin starts cracking deeply, bleeding easily, or leaking yellow fluid,
• You suddenly feel deep, stiff, or aching joint pain in your hands, feet, or back.

References

Psoriasis: a brief overview - PMC 

Psoriasis Symptoms, Causes, & Risk Factors | NIAMS 

Editorial: The World Health Organization (WHO) Fungal Priority Pathogens List in Response to Emerging Fungal Pathogens During the COVID-19 Pandemic - PMC 

Fungal infections diagnosis – Past, present and future - PMC