What should you know about psoriasis causes?

The immune system sends inflammatory signals in the skin. New cells then reach the surface too quickly, creating raised, thickened or scaly areas. A family tendency can make this response more likely, but a person may develop psoriasis without a known affected relative.

Flares can follow skin injury, infections, emotional strain, smoking, alcohol, or some medicines. Triggers differ between people, and a flare can also appear without an obvious cause. Psoriasis is not caused by poor hygiene and cannot be passed from one person to another.

Notice patterns in your skin, including changes after illness, injury, stress or a new medicine. Use a fragrance-free moisturiser to reduce dryness and protect the skin from cracking. Avoid scratching and harsh scrubbing, which can aggravate irritated areas.

A clinician can confirm whether the pattern fits psoriasis and discuss treatments matched to the affected sites and severity. Learn more about [Psoriasis](/conditions/psoriasis/) and related symptoms such as [Itchy Skin](/symptoms/itchy-skin/) or [Skin Redness](/symptoms/skin-redness/).

Arrange a medical assessment if a new rash is spreading, keeps returning, affects the scalp or nails, or does not settle with gentle skin care. Seek prompt help for painful, swollen joints, because psoriasis can occur with inflammatory joint disease. Urgent assessment is needed for widespread redness with fever, marked tenderness, or feeling very unwell.

Could this be psoriasis or another rash? Which triggers should I track? What treatment is suitable for the affected areas? Should I report joint stiffness, nail changes or scalp symptoms?