Psoriasis cannot be cured, but it is very treatable, and the right treatment depends on the type, how severe it is and where it is on the body, not on working through a fixed order. The NHS describes the main symptom as dry, itchy, sore, flaky patches of skin forming what look like silvery-white scales, with flare-ups and better periods.

The single most useful thing to understand is that treatment is matched to the disease rather than applied in one sequence for everyone. Creams suit mild psoriasis, which DermNet notes is generally treated with topical agents alone. Moderate to severe disease can go straight to phototherapy or a systemic medicine, often combined with each other or with a topical, rather than only being reached after creams have failed. Which combination is right depends on the type, severity and site of the psoriasis.

Key takeaways

  • It is not contagious and not caused by poor hygiene. It is thought to involve a problem with the immune system.
  • The skin makes more cells than usual, which is what creates the patches.
  • Onset clusters in two age bands, often between 15 and 25 or between 50 and 60.
  • Treatment depends on type, severity and location, and often combines several approaches rather than following one fixed order.
  • Vitamin D creams and emollients are the usual starting point for mild disease, alongside steroid creams and coal tar preparations.
  • Moderate to severe disease has more options, including light therapy and systemic medicines, which DermNet says can be used together rather than only after creams stop working.
  • Psoriatic arthritis can develop later, and it affects the joints permanently if unmanaged.
  • Family history matters, and so do triggers including stress, alcohol, smoking and obesity.

What causes psoriasis?

The skin producing more cells than usual, driven by something in the immune system that is not fully understood.

The NHS puts it directly: psoriasis is caused by your skin making more skin cells than usual, creating patches on the skin. It is not known why or how this happens, but it is thought to be caused by a problem with the immune system. You are more likely to have it if a family member does, and DermNet’s figure for that link is that about one in three people with psoriasis has a family member with it too.

That hedge is worth preserving rather than smoothing over. Articles that confidently explain the mechanism are going beyond what the evidence supports, and it matters because it is also why no treatment currently cures it.

Triggers that can worsen it or cause a flare-up include stress, drinking alcohol or smoking, and living with obesity. DermNet adds a more specific one: stopping oral steroids, or a strong topical steroid, abruptly, sometimes called steroid withdrawal rebound, which is part of why the advice below is not to stop a systemic medicine without guidance. These are worth knowing not because managing them replaces treatment, but because they are the part of the picture you have some control over.

How does treatment escalate?

Guided by type, severity and where the psoriasis is: creams for mild disease, and phototherapy or systemic medicines, often together, once it is moderate to severe.

The NHS is explicit that how psoriasis is treated depends on the type, how severe it is, and where it is on the body, and that you may need a combination of different treatments. DermNet’s own severity split gives a sense of why: it estimates psoriasis is mild in around 60% of people, moderate in 30% and severe in 10%, so most people’s starting point is topical treatment, but that is a reflection of how common mild disease is, not a rule that moderate or severe psoriasis must pass through creams first.

Topical treatment, for mild disease. The main treatments listed are:

  • Vitamin D creams, lotions, ointments and gels. Calcipotriol is the common ingredient, and this is frequently the mainstay for plaque psoriasis.
  • Emollients, moisturisers you apply and wash with. As with eczema, these are foundational rather than incidental.
  • Steroid creams, lotions or gels, often used alongside a vitamin D preparation, sometimes as a combination product.
  • Other treatments for skin or scalp, such as coal tar.

Phototherapy (light therapy), for moderate to severe disease, often alongside a topical or systemic medicine. Controlled exposure to specific wavelengths under supervision. Worth distinguishing clearly from sunbathing, which is not the same thing and carries its own risks.

Systemic medicines, for moderate to severe disease. DermNet lists these as warranted, together with phototherapy, once psoriasis is moderate to severe, rather than only once topical treatment has been tried and failed. Acitretin, methotrexate and ciclosporin work throughout the body, which is why they require monitoring, usually including regular blood tests. Biologic medicines are used where these are unsuitable or insufficient.

A GP can prescribe some treatments, or you may be referred to a dermatologist.

Why does psoriasis need watching beyond the skin?

Because some people develop psoriatic arthritis, and joint damage does not reverse.

The NHS notes that some people with psoriasis can develop psoriatic arthritis as they get older, an inflammatory condition affecting the joints. DermNet’s figure is that it can affect up to 40% of people whose plaque psoriasis started early and became chronic, which is why joint symptoms deserve the same attention as skin ones rather than being treated as a separate, lesser concern.

This is the reason psoriasis is not purely cosmetic. Skin patches are visible and uncomfortable; joint inflammation left unmanaged can cause lasting damage. Joint pain, stiffness, particularly morning stiffness lasting a while, or swelling in fingers or toes are reasons to raise it specifically, rather than assuming they are unrelated to a skin condition.

Tell whoever manages your psoriasis about joint symptoms even if they seem minor. The skin and the joints are often managed by different people, and the connection gets missed when nobody joins them up.

Does the climate here help or hurt?

Sun exposure improves psoriasis for many people, which makes this an unusual case, but it comes with real caveats.

Many people with psoriasis find their skin improves with sunlight, and this is the principle behind supervised light therapy. DermNet’s own aggravating-factors list still counts sun exposure as a trigger in around one in ten people with psoriasis, so “sun helps” is a majority pattern, not a universal one. In a place with abundant sun, that mostly sounds like an advantage.

DermNet’s aggravating-factors list names sunburn specifically, alongside other skin injuries, as a trigger through the Koebner phenomenon, where new plaques form at a site of damaged skin. Supervised phototherapy, such as the UVB, PUVA or targeted excimer laser treatment DermNet describes, controls the exposure precisely; unsupervised sun exposure does not carry that control, so a sunburn can just as easily trigger a flare as settle one. Several systemic psoriasis medicines also increase sun sensitivity and need their own sun protection, worth checking against the specific product in use. Dry indoor air from air conditioning pulls moisture from the skin, working against emollients in the same way it does with eczema.

So the practical position is not “get more sun”. It is that sun may help, in moderation, without burning, and with attention to what your medicines do.

When should I go back to a doctor?

When treatment stops working, or when it starts causing problems.

The NHS lists two reasons to see a GP: having symptoms of psoriasis, and having psoriasis where the treatment is not working or is giving you side effects.

The second is worth taking seriously rather than tolerating. A treatment that has stopped working, or that is causing side effects, is information that the current approach needs to change, whether that means adjusting the topical regimen or moving to phototherapy or a systemic medicine, not a reason to simply apply more of the same.

Also worth raising: the NHS notes explicitly that living with psoriasis can be difficult, and that if it affects your mental health you may be referred to a mental health specialist. That is a stated part of care rather than an aside.

Do and don’t

Do:

  • Use emollients regularly, not only during flares.
  • Use vitamin D and steroid preparations as directed, including on clear-looking skin if instructed.
  • Report joint pain, stiffness or swelling promptly.
  • Go back if a treatment stops working or causes side effects.
  • Attend monitoring blood tests if you are on a systemic medicine.

Don’t:

  • Expect a cure, or trust a claim that promises one.
  • Substitute unsupervised sunbathing for light therapy.
  • Stop a systemic medicine without advice.
  • Dismiss joint symptoms as unrelated to your skin.
  • Ignore the mental health effect; it is part of the condition’s burden.

Frequently asked questions

Is psoriasis contagious? No. It is an immune-related condition in which the skin produces cells faster than usual. It cannot be passed to anyone by contact.

At what age does it usually start? It can start at any age, but symptoms often begin either between 15 and 25 or between 50 and 60.

Are systemic medicines a last resort? Not necessarily. DermNet’s guidance is that moderate to severe psoriasis warrants systemic treatment and/or phototherapy, often combined, which can mean starting there rather than only reaching it after topical treatment has failed. They still need monitoring because they act throughout the body rather than only on the patches.

Where to go next

The skin care category lists what is stocked here, and plaque psoriasis and psoriatic arthritis approach it from the diagnosis. If you are on a systemic medicine, the storage and heat considerations in storing medicine in a Gulf summer apply.

MedicForce option: our skin listings show active ingredient and strength, which is what distinguishes the tiers of topical treatment from one another.

  • Psoriasis, NHS symptoms, causes, triggers, the full treatment range from creams to light therapy and medicines, and the link to psoriatic arthritis.
  • Psoriasis, DermNet a fuller clinical reference covering the types and their treatment.