Plaque Psoriasis

Key facts

• Plaque psoriasis is the most common form of psoriasis, a chronic autoimmune condition where the immune system speeds up skin cell turnover faster than cells can shed, producing raised, scaly patches.
• Patches typically appear on the elbows, knees, scalp, and lower back, ranging from a few small spots to widespread involvement.
• Stress, skin injury, certain infections, alcohol, and some medicines can trigger flare-ups; the condition follows a relapsing pattern of clear skin and flares.
• Topical calcipotriol, betamethasone, and tazarotene are standard treatments for mild to moderate disease.

What drives flare-ups

Psoriasis follows a relapsing pattern: periods of clear skin interrupted by flare-ups. Common triggers include stress, skin injury such as cuts or sunburn, certain infections, and alcohol. Hot, humid weather can worsen sweating around affected skin, while cold, dry, air-conditioned environments can also irritate plaques and slow healing. Some people notice flares linked to specific medicines or dietary changes.

Managing plaques with topical treatments

Most mild to moderate plaque psoriasis is managed with topical preparations applied directly to affected skin. Calcipotriol is a vitamin D analogue that slows excess skin cell growth and reduces scaling. Betamethasone is a corticosteroid that calms inflammation and eases redness; the two are often combined since they target different parts of the inflammatory process. Tazarotene, a topical retinoid, helps normalise skin cell turnover and can be particularly effective for thick, stubborn plaques. Wider skin health support is covered under skin care.

When to see a doctor

See a doctor promptly if plaques spread rapidly, cover large areas of the body, or come with joint pain, which may indicate psoriatic arthritis and needs separate assessment. Keeping skin moisturised, avoiding known personal triggers, and sticking with treatment even between flares all help keep the condition under control long term.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.