Sun protection and lupus: photosensitivity and UV exposure

Sunlight can affect people living with lupus differently.

For some people, ultraviolet (UV) light can cause or worsen skin rashes. UV exposure may also be associated with increased lupus activity in some people.

This sensitivity to ultraviolet light is known as photosensitivity.

Protecting yourself from UV exposure does not mean you have to avoid going outdoors altogether. It means understanding how UV can affect lupus and finding practical ways to protect your skin while continuing to enjoy everyday life.

On this page

• What is photosensitivity?
• Why does UV protection matter in lupus?
• UVA and UVB
• Choosing sunscreen
• How to use sunscreen effectively
• Clothing, hats and shade
• Cloudy days and the UV index
• UV exposure through windows
• Heat and UV are not the same thing
• Medicines that can increase sun sensitivity
• Vitamin D and sun protection
• What to do if you develop a rash
• When to speak to your healthcare team

What is photosensitivity?

Photosensitivity means that your skin or other lupus symptoms may react unusually to ultraviolet light.

Some people with lupus develop a rash after spending time in sunlight. This might appear on areas such as the:

• face
• neck
• upper chest
• arms
• hands
• other exposed areas of skin

The reaction may not always happen immediately.

For some people, skin symptoms can appear hours or even days after exposure, which can make it difficult to recognise the connection.

Photosensitivity also varies considerably between people.

Some people are extremely sensitive to relatively small amounts of UV exposure, while others are much less affected.

If you are unsure whether your skin symptoms are photosensitive, discuss them with your rheumatology or dermatology team.

Why does UV protection matter in lupus?

Ultraviolet light can contribute to lupus-related skin problems in people who are photosensitive.

Current UK specialist guidance recommends that people with systemic lupus erythematosus use high-SPF, broad-spectrum protection against both UVA and UVB and consider additional measures such as protective clothing and reducing unnecessary sun exposure.

Sun protection is therefore an important part of lupus self-management.

However, it is worth keeping this in perspective.

Using sunscreen cannot guarantee that you will never experience a lupus flare, and developing symptoms after being outdoors does not automatically mean lupus has become more active.

If several symptoms change or you are concerned about a possible flare, contact your healthcare team.

You can read more in our Understanding lupus flares guide.

UVA and UVB

Sunlight contains different types of ultraviolet radiation.

The two most important for skin protection are UVA and UVB.

UVB

UVB is strongly associated with sunburn.

The SPF number on sunscreen mainly tells you how much protection the product provides against UVB.

UVA

UVA penetrates more deeply into the skin.

Sunscreen packaging in the UK may show UVA protection using:

• a UVA symbol inside a circle
• a star rating, usually from 1 to 5 stars

A higher UVA star rating gives greater UVA protection.

For someone with lupus, it is important to choose protection against both UVA and UVB, rather than looking only at the SPF number.

Choosing sunscreen

The NHS specifically advises people with lupus to use high-factor sunscreen of at least SPF 50.

When choosing a sunscreen, look for:

• SPF 50 or 50+
• broad-spectrum UVA and UVB protection
• a 4- or 5-star UVA rating, or the UVA symbol in a circle

Sunscreen is only one part of UV protection.

It works best alongside clothing, shade and sensible decisions about when and how long you spend in strong sunlight.

Choose a sunscreen that you are comfortable using regularly.

If a product irritates your skin or you have difficulty finding one that suits you, ask your pharmacist, GP or dermatology team for advice.

How to use sunscreen effectively

Sunscreen only provides the expected protection if enough is applied.

Apply sunscreen generously to exposed skin, including areas that can easily be forgotten such as:

• ears
• neck
• upper chest
• backs of the hands
• scalp where hair is thin

Follow the manufacturer’s instructions.

As a general rule, sunscreen should be reapplied regularly — usually at least every two hours when you are exposed to sunlight.

Reapply sooner after:

• swimming
• sweating heavily
• towel drying
• activities that may rub sunscreen off

Water-resistant sunscreen still needs to be reapplied.

Do not use sunscreen as a reason to stay outside in strong sunlight for longer than you otherwise would.

Clothing, hats and shade

Clothing provides another useful physical barrier against UV exposure.

Depending on the weather and your own sensitivity, consider:

• long sleeves
• trousers or longer clothing
• closely woven fabrics
• clothing designed with a UV protection factor
• a broad-brimmed hat
• sunglasses that provide UV protection

A wide-brimmed hat offers more protection to the face, ears and neck than a baseball cap.

Shade can also make a significant difference.

In the UK, the sun is generally strongest between 11am and 3pm from March to October.

If you are particularly photosensitive, consider planning longer outdoor activities for times when UV exposure is lower.

Cloudy days and the UV index

Cloud does not completely block ultraviolet radiation.

You can still be exposed to significant UV on a cloudy or cooler day.

This means temperature alone is not a good guide to how much UV is present.

The UV index can be more useful.

It is available through many weather apps and forecasts.

For the general population, the NHS recommends considering sun protection when the UV index is 3 or higher.

If you have significant photosensitivity, your healthcare team may recommend more consistent protection depending on your individual circumstances.

UV exposure through windows

Glass blocks much of UVB, but some UVA can pass through certain types of glass.

For most everyday situations this may not cause a problem, but it can be relevant to some people with significant photosensitivity, particularly where they spend long periods close to windows or travelling in a car.

There is no need for everyone with lupus to install specialist window protection.

If sunlight through windows appears to affect your skin, speak to your dermatology or rheumatology team about whether additional measures would be useful for you.

Heat and UV are not the same thing

Hot weather and ultraviolet exposure are related but they are not the same thing.

You can experience:

• high UV levels on a relatively cool day
• hot temperatures when UV exposure is relatively low

Some people with lupus also find hot weather difficult because of fatigue, medicines or other health problems, but this should not automatically be described as photosensitivity.

During hot weather, general advice such as keeping cool and drinking enough fluid is still important.

If you have kidney, heart or another condition where you have been advised to restrict fluids, follow the advice given by your healthcare team rather than increasing your fluid intake automatically.

Medicines can sometimes increase sun sensitivity

Some medicines can make the skin more sensitive to sunlight.

This is not unique to lupus medicines.

Medicines known to cause photosensitivity can include some:

• antibiotics
• anti-inflammatory medicines
• treatments for skin conditions
• other prescription medicines

The effect depends on the individual medicine and the person taking it.

Do not stop a medicine because you are concerned about sun sensitivity.

Check the patient information leaflet or ask a pharmacist or healthcare professional if you are unsure whether one of your medicines can increase sensitivity to sunlight.

If a medicine is responsible, your healthcare team can advise you about the most appropriate response.

What about sunbeds?

Sunbeds and tanning lamps expose the skin to ultraviolet radiation.

They are not a safe alternative to natural sunlight and should be avoided.

This is particularly important if you have lupus or another condition that causes photosensitivity.

Vitamin D and sun protection

Sunlight helps the body produce vitamin D.

People who need to limit sun exposure because of photosensitivity may therefore have a greater risk of having low vitamin D levels.

This does not mean you should deliberately expose yourself to UV light to increase your vitamin D.

Vitamin D can also come from diet and supplements.

If you regularly avoid sunlight or use extensive sun protection, ask your GP or healthcare team whether your vitamin D intake or level needs to be considered.

Do not take high-dose vitamin D supplements unless they have been recommended for you.

What if I develop a rash after being in the sun?

If you develop a rash after UV exposure:

• move out of direct sunlight
• avoid further exposure while the skin is affected
• continue appropriate sun protection
• take photographs if the rash may have disappeared before your appointment
• note when the exposure occurred and when the rash appeared

Do not assume every rash is lupus.

Skin reactions can have many causes, including medicines, allergies, infections and other skin conditions.

Contact your GP, rheumatology team or dermatology team if:

• the rash is new
• it keeps returning
• it is widespread
• it is becoming worse
• it is painful
• it does not settle
• you are unsure what is causing it

Seek urgent medical advice if a skin reaction is severe, involves significant blistering or peeling, or occurs alongside symptoms such as difficulty breathing or swelling of the face or mouth.

Does sunlight mean I am having a lupus flare?

Not necessarily.

UV exposure may contribute to increased lupus activity in some people, but one episode of increased fatigue, joint pain or a skin rash after being outdoors does not prove that you are experiencing a systemic lupus flare.

Other explanations may need to be considered.

If several symptoms change together, symptoms persist or you are concerned that your lupus may be becoming more active, contact your healthcare team.

Do not alter prescribed lupus medicines yourself because you think sunlight has caused a flare unless you have been specifically given an individual plan telling you to do so.

Our Understanding lupus flares guide explains what a flare means and when to seek medical advice.

Practical sun protection checklist

Before spending significant time outdoors, it may help to check:

• What is today’s UV index?
• Have I applied SPF 50+ broad-spectrum sunscreen?
• Does my sunscreen provide strong UVA protection?
• Have I covered easily forgotten areas?
• Do I have sunscreen with me to reapply?
• Would protective clothing or a hat help?
• Is shade available?
• Am I taking any medicine that increases sun sensitivity?
• Do I know what to do if my skin reacts?

Sun protection should support your life rather than make you afraid of going outdoors.

The aim is to understand your own level of photosensitivity and make practical choices that reduce unnecessary UV exposure.

When should I speak to my healthcare team?

Ask your GP, rheumatology or dermatology team for advice if:

• sunlight repeatedly causes skin rashes
• you appear to be becoming more sensitive to UV
• your existing sun-protection measures are not enough
• you develop new or changing skin symptoms
• you are unsure whether a medicine is increasing photosensitivity
• you are concerned about vitamin D
• symptoms other than your skin are changing after UV exposure
• you are worried that lupus may be becoming more active

Your healthcare team can help distinguish photosensitivity from other skin problems and advise you about protection appropriate to your individual circumstances.

Enjoying time outdoors with lupus

Photosensitivity can sometimes make being outdoors feel complicated.

You may find yourself checking the weather more carefully, carrying sunscreen or changing when you plan activities.

Over time, many of these precautions can simply become part of your normal routine.

You do not need to avoid daylight completely.

Good UV protection is about reducing unnecessary exposure while allowing you to continue doing the things that matter to you.

About this information

This information is for general guidance and does not replace advice from your GP, rheumatology team, dermatologist, pharmacist or another healthcare professional.

Photosensitivity varies significantly between people living with lupus. Follow any individual advice you have been given by your healthcare team.

Information updated: September 2026

Sources used for this page

NHS — Lupus
NHS information about lupus symptoms, photosensitivity and sun-protection advice, including the recommendation that people with lupus use at least SPF 50 sunscreen.

NHS — Sunscreen and sun safety
General NHS guidance about UVA and UVB protection, sunscreen application, reapplication, clothing, shade and the UV index.

British Society for Rheumatology — 2026 guideline for the management of children, young people and adults with systemic lupus erythematosus
Current UK specialist guidance recommending high-SPF broad-spectrum UVA and UVB protection, reduced UV exposure and protective clothing for people living with SLE.

EULAR — Recommendations for the non-pharmacological management of systemic lupus erythematosus and systemic sclerosis
Evidence-based recommendations covering sun protection and other non-pharmacological aspects of managing lupus.