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At a glance
- Psoriasis is a long-term immune-mediated skin condition causing thickened, red, scaly patches (plaques).
- It commonly affects the scalp, elbows, knees and lower back, and can affect nails.
- It is not contagious, and severity ranges from a few patches to widespread disease.
- It tends to come and go in flares, and while there is no cure, it can usually be well controlled.
- Some people also develop psoriatic arthritis.
Symptoms and types
The commonest form, plaque psoriasis, causes well-defined red patches topped with silvery scale that can itch, crack or bleed. Patches are often symmetrical, appearing on both elbows or both knees. Other patterns include guttate (small drop-like spots, often after a throat infection), scalp psoriasis (scaly, itchy areas along the hairline), nail psoriasis (pitting, ridging, thickening or lifting of the nail), inverse psoriasis (smooth, red areas in skin folds such as the groin, armpits or under the breasts) and, rarely, more serious pustular or erythrodermic forms that involve much of the skin. Symptoms typically come and go in flares, with quieter periods in between. In people with darker skin tones, plaques may look more purple, grey or brown, and healed areas can leave temporary dark or pale marks.
What causes it and common triggers
Psoriasis is driven by an overactive immune system that speeds up the normal turnover of skin cells, so cells build up on the surface as scaly plaques. It has a strong genetic basis and is not caused by poor hygiene, diet or anything you have done wrong. It is not an allergy and cannot be caught from someone else.
Although the tendency is inherited, flares are often set off by triggers. Common ones include emotional or physical stress, skin injury such as cuts, scratches, sunburn or friction (known as the Koebner effect), infections (especially throat infections), certain medications, smoking, heavy alcohol use, being significantly overweight and, for some people, cold or dry weather. Learning your own triggers is a useful part of managing the condition.
Who is at risk
Psoriasis can begin at any age but most often starts in early adulthood or later in mid-life. It affects men and women roughly equally. The strongest risk factor is family history — having a parent or sibling with psoriasis raises your chance of developing it, though many people have no known relative affected. Smoking, excess weight and high alcohol intake are linked both to developing psoriasis and to more severe, harder-to-treat disease. Ongoing stress and repeated skin infections can also play a part. Having risk factors does not mean you will definitely develop it, and a doctor can assess your individual picture.
How it is diagnosed
Psoriasis is usually a clinical diagnosis — a GP or dermatologist can often recognise it by examining the skin, scalp and nails and asking about your symptoms, family history and any joint pains. No blood test confirms psoriasis. Occasionally, if the appearance is unclear or another condition needs to be ruled out, a doctor may take a small skin biopsy for examination under a microscope. Because psoriasis is linked to joint and general health, a doctor may also ask about joint stiffness or swelling and check factors such as weight, blood pressure and, where relevant, blood sugar and cholesterol.
Complications and associated conditions
Psoriasis is more than skin-deep. Up to a third of people develop psoriatic arthritis, which causes joint pain, stiffness and swelling and can lead to lasting joint damage if untreated, so new joint symptoms should always be checked. Psoriasis is also associated with a higher risk of cardiovascular and metabolic problems, including heart disease, high blood pressure, diabetes and obesity, which is why doctors consider overall health, not just the skin. The emotional impact matters too: visible plaques, itch and discomfort can affect confidence, sleep, work and relationships, and low mood or anxiety are common. These effects are valid reasons to seek help and can improve when the skin is treated.
How it is treated
There is no cure, but treatment can control psoriasis very effectively and is matched to how severe it is. Treatment usually follows a step-by-step ladder.
- Self-care and moisturisers: regular use of moisturisers (emollients) softens scale, reduces itch and cracking, and is the foundation for every level of treatment.
- Topical treatments: for mild-to-moderate disease, doctors commonly prescribe steroid creams, vitamin-D creams and medicated shampoos or scalp preparations applied to the affected areas.
- Phototherapy: controlled ultraviolet light delivered in a clinic can help moderate psoriasis that has not responded to creams alone.
- Systemic and biologic medicines: for moderate-to-severe or widespread psoriasis, or when it affects the joints, oral or injected medicines that calm the overactive immune system are used. Newer biologic injections target specific immune pathways and can achieve clear or near-clear skin, with regular monitoring by a specialist.
Alongside medical treatment, managing triggers and general health — not smoking, moderating alcohol, keeping to a healthy weight and reducing stress — supports better control.
Living with psoriasis and self-care
Day-to-day habits make a real difference. Moisturise regularly, especially after bathing, and use lukewarm rather than hot water with gentle, fragrance-free cleansers. Avoid scratching or picking, which can worsen plaques, and protect the skin from cuts and sunburn. Some sunlight can help psoriasis, but burning makes it worse, so sensible sun protection matters in Singapore’s climate. Where possible, work on known triggers: stop smoking, moderate alcohol, aim for a healthy weight and find ways to manage stress such as exercise, good sleep or relaxation. Applying treatments consistently, even during quieter periods if advised, gives the best results. Because psoriasis can affect mood and confidence, do not hesitate to talk to your doctor about the emotional side; support and effective skin treatment often go hand in hand. Connecting with others who have the condition can also help you feel less alone.
When to see a doctor
See a doctor if you have persistent scaly patches, if psoriasis is spreading or affecting your scalp, nails, face or genitals, or if it is affecting your sleep, mood or quality of life, so an effective treatment plan can be arranged. You should also seek review if you develop joint pain, stiffness or swelling, which may signal psoriatic arthritis. A GP or polyclinic can start treatment and refer you to a dermatologist if needed. Seek prompt medical care if a large area of skin becomes suddenly red, sore or covered in pustules, or if you feel unwell with fever alongside a severe skin flare, as rare severe forms of psoriasis need urgent treatment.
Common questions
Is psoriasis curable?
There is no cure, but modern treatments can control it very effectively, often clearing the skin.
Is psoriasis contagious?
No. It is an immune condition and cannot be passed to others.
Does psoriasis affect the joints?
It can. Up to a third of people develop psoriatic arthritis, so joint symptoms should be checked.
Is psoriasis caused by diet or poor hygiene?
No. It is an immune-mediated condition with a genetic basis. Diet and hygiene do not cause it, though a healthy weight, not smoking and moderating alcohol can help control flares.
Will psoriasis go away on its own?
Psoriasis is long-term and tends to come and go in flares rather than disappear permanently, but treatment can keep the skin clear or nearly clear for long periods.
Related guides
Sources
- Dermatological Society of Singapore — psoriasis.
- HealthHub Singapore — psoriasis.
- National Skin Centre — psoriasis.
- UK NHS — psoriasis.
This article is for general information only and does not replace a consultation with a qualified doctor. Please seek personalised medical advice for your situation.