Psoriasis

Table of Contents

• What is psoriasis?
• Types of Psoriasis
• General symptoms of psoriasis
• Psoriasis triggers and factors
• Precautions and treatments
• Conclusion
• Psoriasis FAQ

Types of psoriasis

There are a number of different types of psoriasis, but the following are the most common.

Plaque Psoriasis

Plaque psoriasis is by far the most common type of psoriasis, affecting 9 out of 10 sufferers. It is also known as psoriasis vulgaris. Normal skin cells are replaced every 3-4 weeks but in psoriasis this happens every 3-4 days. This is thought to be due to genetics and environmental factors.

Plaque psoriasis appears as well-defined patches of irregularly shaped, or oval, pink-red skin covered in silver-white scales (referred to as ‘plaques’). The thickness of the scales can vary. On darker skin the plaques may be grey coloured. The plaques are most often on the forearms, shins, knees, elbows, scalp, behind the ears, on the torso and around the buttocks. The skin may be itchy, but not usually sore, and can also crack – especially if the palm of the hands or soles of the feet are affected.

While it is a long-term condition, around 1 in 4 people with plaque psoriasis can find it goes away for months at a time.

Erythrodermic psoriasis

Erythrodermic psoriasis is a rare, potentially life-threatening type of psoriasis. It is thought be caused by genetics and some environmental factors. Erythrodermic psoriasis can develop gradually or come on suddenly – spreading across the whole body to affect more than 90% of the skin. You might also feel unwell with fatigue, fever and develop swollen lower legs. If you have these symptoms you should go straight to A&E.

Erythrodermic psoriasis can happen in anyone with plaque psoriasis but can be triggered by factors like infections or skin irritants.

Flexural psoriasis

Flexural psoriasis, also known as inverse psoriasis, affects the creases and folds of your skin. It can cause itchy, red, glazed areas in your skin folds, such as the armpits, groin, genitals, buttocks and under the breasts. Sweat or rubbing the affected skin can cause further irritation. The condition is more common in people who are overweight, immobile or elderly. You may also find you’re more prone to developing yeast infections in the same areas as your flexural psoriasis.

Guttate Psoriasis

This form of psoriasis is also known as ‘raindrop’ or ‘droplet’ psoriasis because it looks like droplets on the skin. Certain people who have had guttate psoriasis will develop chronic plaque psoriasis later in their life. Guttate Psoriasis most frequently occurs in children and teenagers, usually after a throat infection caused by streptococcal bacteria. Even though it may be caused by an infection, guttate psoriasis is not contagious. The condition develops over the course of a week, with many small, raised, scaly patches that are round or oval and pink or red appearing all over the body.

Nail psoriasis

Nail psoriasis affects the fingernails and toenails with a range of symptoms. Nails may turn orange-yellow, become pitted, start to come away from your skin or disintegrate. The condition is more likely to affect your fingernails than your toenails. Nail psoriasis can happen in anyone with psoriasis, but it is particularly common if you also have arthritis-associated psoriasis.

Pustular Psoriasis

This is a rare type of psoriasis where there are pus-filled spots on or surrounded by red skin. There are two main types of pustular psoriasis: generalised and localised. Around 5% of people with psoriasis experience localised pustular psoriasis, but in rare cases this can be generalised which can be life threatening. Localised pustular psoriasis (also known as palmoplantar psoriasis) appears as yellow-brown blisters, known as ‘pustules’, on your palms and soles along with scaly skin and redness on your toes and fingertips. In generalised pustular psoriasis, redness spreads quickly over your skin followed by the development of multiple white pustules that group together to form large areas of pus. These blisters are not contagious.

Pustular psoriasis is more common in those who have, or have had, plaque psoriasis. However, you can develop it even if you’ve never had psoriasis before. Triggers range from stress, certain medicines and infections to pregnancy or too much sun. Localised pustular psoriasis usually occurs in those aged 20-60, particularly if you smoke.

Scalp Psoriasis

Scalp psoriasis looks like plaque psoriasis, but affects your scalp. Your hair traps the scale making it hard to rub away, and as a result the plaques can become thick. Some people find that only parts of their scalp is affected, while for others it’s across their whole scalp. In some cases scalp psoriasis can even cause bald patches, but the hair will normally grow back. Up to 9 out of 10 people with psoriasis develop it on their scalp. Some people may experience itchy scalp, a feeling of tight skin and occasionally soreness if the skin cracks.

Psoriasis triggers and factors

Although psoriasis can be a genetic condition, there are many other reasons why you can develop it – or triggers that can make it flare up. Here are the common triggers that can either bring on psoriasis, or cause a flare-up if you already have it.

Medications

Medicines that can cause or trigger psoriasis include:

• Lithium
• Anti-malarial drugs
• Some blood pressure drugs, such as beta-blockers and ACE inhibitors
• Coming off steroids too quickly, like prednisone
• Some antibiotics, like penicillin and tetracycline
• Non-steroidal anti-inflammatory drugs
• Some anti-depressants, like trazodone

Stopping steroid medicines suddenly can trigger pustular or erythrodermic psoriasis.

Injury

Damage to the skin from scratches, burns, insect bites, piercings, tattoos or sunburn can trigger psoriasis. Also known as the ‘Koebner phenomenon’, this happens in about 25% of people with psoriasis – with symptoms developing about 1-2 weeks after the skin is damaged.

Lifestyle

Smoking and excessive or frequent drinking can make your psoriasis flare up. Localised pustular psoriasis usually only develops in smokers. Those who drink too much may find this makes their psoriasis treatment less effective. Being overweight increases your chances of developing flexural psoriasis.

Stress

Stress is a common psoriasis trigger.

Weather

Weather can be a trigger – both dry, cold weather or too much sun can cause a flare in some people with psoriasis. However, for some people, sunlight can help improve their psoriasis.