Health and well-being

The most common summer skin problems (and how to relieve them)

23/7/2026
7 min


Summer is the season for vacations, swimming, hiking and long days spent outdoors. But between the heat, sweat, sun exposure and humidity, our skin can sometimes decide to make things a little more complicated.

Heat rash, sunburns, itching, irritation, fungal infections… several skin problems become more common during the hot summer months.

Let’s talk about it! Here are some of the most common summer skin problems, along with simple steps and healthy habits that can help prevent them and keep your skin healthy throughout the season.

Why do we have more skin problems in summer?

Our skin is our body’s first line of defence against the environment. During the summer, it has to deal with several factors that can make it more vulnerable:

  • Heat and sweat: Sweat can become trapped on the skin, leading to irritation and clogged pores.
  • Humidity: Warm, humid environments create ideal conditions for certain types of fungi to grow.
  • Friction: Tight clothing, wet swimsuits or physical activities can irritate certain areas of the skin.
  • Sun exposure: Too much exposure to UV rays can cause sunburn, but it can also worsen some pigmentation concerns.
  • Swimming: Chlorine, salt water or certain microorganisms found in water can trigger skin reactions.
  • Insects: Enough said. Between black flies, mosquitoes, ticks, wasps, deer flies… summer comes with its fair share of unwanted visitors!

All of these factors can lead to different skin reactions. Some are simply uncomfortable, while others may require treatment.

The culprits behind summer skin problems

Culprit no. 1: Heat

  1. Heat rash: when your skin can no long eliminate sweat

Heat rash, also called miliaria or “prickly heat,” is one of the most typical summer skin problems.

It happens when the tiny ducts that allow sweat to reach the skin’s surface become blocked. The sweat then gets trapped under the skin, causing a rash.

Heat rash is especially common in babies and young children, since their ability to regulate their body temperature is still developing.

What does heat rash look like?

It often appears as:

  • Small red or pink bumps
  • Itching
  • A prickling or burning sensation
  • Sometimes small blisters

It usually develops in areas where sweat collects or where skin rubs against clothing:

  • The neck
  • The chest
  • The back
  • The armpits
  • Skin folds
  • The inner thighs

How to relieve heat rash?

The goal is simple: help your skin stay cool and dry.

A few helpful tips:

  • Wear loose, lightweight clothing, ideally made from breathable fabrics
  • Avoid covering irritated areas too much
  • Take cool or lukewarm showers
  • Use a fan or air conditioning when possible
  • Avoid thick creams that can trap heat and further block pores

Most cases of heat rash go away once the skin returns to a normal temperature.

  1. Acne and breakouts: why they show up more in summer

Summer is often considered to be the time when skin looks more radiant. But for some people, it is actually the season of breakouts.

Heat naturally increases the production of sebum (the oil produced by the skin). When sweat, sebum, bacteria and certain skincare products build up, pores can become clogged and lead to acne flare-ups.

The areas most commonly affected are the face, neck, back and chest.

How to reduce summer breakouts?

A few simple habits can make a big difference:

  • Gently rinse or cleanse your skin after sweating heavily
  • Blot sweat with a clean towel instead of rubbing your skin, which can cause irritation
  • Wash clothing, hats, headbands and towels used during sports or outdoor activities regularly
  • Choose products labelled non-comedogenic or oil-free, which are less likely to clog pores

Keep in mind: heat rash (mentioned above) is not acne and should not be treated the same way.

  1. Fungal infections: why fungi love summer

Fungi thrive in warm, damp environments. That’s why certain skin infections become much more common during the summer.

After a day at the beach, an intense workout or several hours spent in closed shoes, your skin can stay damp long enough to create the perfect environment for fungi to grow.

Some of the most common fungal skin infections include:

Athlete’s foot

Athlete’s foot mainly affects the skin between the toes or on the soles of the feet.

Symptoms may include:

  • Itching
  • A burning sensation
  • Dry, cracked or peeling skin
  • Redness

It is more common during the summer because of sweaty feet, closed shoes and exposure to damp surfaces such as locker rooms or pool decks.

How to help prevent fungal infections?

A few simple habits can go a long way:

  • Dry your feet thoroughly after showering or swimming
  • Change your socks every day (and after activities that make you sweat)
  • Avoid staying in a wet swimsuit or damp clothing for long periods
  • Wear breathable footwear whenever possible
  • Avoid sharing towels, shoes or clothing

Over-the-counter antifungal creams are often effective for mild infections. However, if the infection persists despite treatment or appears to be getting worse, book an appointment with a doctor.

Culprit no. 2: The sun

When we think about summer skin problems, sunburn is usually the first thing that comes to mind, and for good reason. Prolonged exposure to UV rays can quickly damage the skin.

But sun exposure can also trigger other skin conditions that are less well known.

  1. Sunburn: when your skin has had too much sun

A sunburn occurs when your skin is exposed to too much ultraviolet (UV) radiation. Symptoms may appear a few hours after sun exposure and become more intense over time.

Besides being painful, repeated sunburns increase your risk of developing certain types of skin cancer later in life.

What should you do if you get a sunburn?

To help your skin recover:

  • Cool the affected area with a lukewarm shower or a cool compress
  • Drink plenty of water, since sunburn can contribute to dehydration
  • Apply a gentle moisturiser or soothing gel
  • Avoid popping blisters, as they help protect the skin while it heals
  • Keep the affected area out of the sun until it has fully recovered

Prevention is your best protection

A few simple habits can greatly reduce sun damage:

  • Use a broad-spectrum sunscreen with SPF 30 or higher
  • Reapply sunscreen regularly, especially after swimming or sweating
  • Seek shade, particularly when UV rays are strongest
  • Wear a wide-brimmed hat and protective clothing whenever possible

  1. Sun allergy: when UV rays trigger a skin reaction

Some people develop a reaction that resembles an allergy after spending time in the sun. The most common form is called polymorphous light eruption (PMLE).

Unlike a sunburn, which mainly causes redness and pain, this reaction often causes:

  • Small red bumps
  • Raised patches
  • Intense itching
  • A burning or prickling sensation

It typically appears on areas exposed to the sun, such as the neck, upper chest, arms and hands.

Certain medications can also make your skin more sensitive to sunlight. This includes some antibiotics, anti-inflammatory medications and other prescription drugs. If you're unsure whether one of your medications increases your sensitivity to the sun, ask your pharmacist or another healthcare professional.

How to reduce your risk of a sun-related skin reaction

  • Avoid prolonged sun exposure during peak UV hours
  • Wear protective clothing and a wide-brimmed hat
  • Choose a sunscreen formulated for sensitive skin
  • See a doctor if your reactions are severe or return every summer

  1. Melasma: why dark spots become more noticeable in summer

Melasma is a pigmentation disorder that causes brown or grey-brown patches, most often on the face. Although these spots are harmless, they can become more noticeable during the summer.

Why? Because sunlight stimulates the cells that produce melanin, the pigment that gives skin its colour. Heat and inflammation caused by environmental factors can also make pigmentation more pronounced.

The cheeks, forehead, upper lip and bridge of the nose are the areas most commonly affected.

How to help reduce melasma during the summer

  • Apply sunscreen every day, even when it's cloudy
  • Choose a broad-spectrum sunscreen with a high SPF
  • Wear a hat and seek shade whenever possible
  • Avoid irritating skincare products that can increase inflammation

Tinted sunscreens containing iron oxides may also be beneficial, as they provide additional protection against visible light, which can worsen certain types of pigmentation.

Culprit no. 3: Swimming

Summer means pools, lakes and beaches. But spending time in the water can sometimes lead to unexpected skin problems.

  1. Swimmer’s itch: a rash after swimming in fresh water

Swimmer’s itch (also called cercarial dermatitis) is a skin reaction caused by microscopic parasites found in certain lakes and ponds.

After swimming, it can cause:

  • Small red bumps
  • Itching
  • Sometimes raised patches that resemble hives

Children are especially susceptible because they tend to spend more time in shallow water.

How to reduce your risk of swimmer’s itch?

  • Avoid swimming in areas where cases have been reported
  • Rinse off with fresh water after swimming
  • Dry your skin thoroughly with a towel as soon as you get out of the water
  • Avoid scratching the rash to help prevent infection

Swimmer’s itch usually clears up on its own, but cool compresses or over-the-counter anti-itch products can help relieve discomfort.

  1. Skin irritation caused by chlorine and swimming pools

Even a well-maintained pool can sometimes irritate your skin.

Chlorine may:

  • Dry out your skin
  • Cause redness
  • Make conditions such as eczema worse

To help protect your skin:

  • Shower after swimming
  • Use a gentle cleanser instead of a harsh soap
  • Apply a moisturiser after drying off

  1. Seabather’s eruption: a rash linked to jellyfish larvae

If you're travelling to certain warm destinations, you may encounter another type of skin reaction known as seabather’s eruption.

This rash is caused by tiny jellyfish or sea anemone larvae that become trapped between your skin and your swimsuit.

It typically causes:

  • Intense itching
  • Small red bumps
  • Skin irritation

The best way to prevent it is to check local swimming conditions before entering the water and rinse your skin as soon as you get out of the ocean.

Culprits no. 4: Plants and insects

Summer is the perfect time for hiking, camping, gardening and picnics. But as much as we enjoy spending time outdoors, nature can sometimes be hard on our skin.

  1. Poison ivy: an itchy reaction that can be hard to ignore

Poison ivy can trigger an allergic skin reaction in many people because of an oily substance called urushiol, which is found in the plant's leaves, stems and roots.

After coming into contact with poison ivy, you may develop:

  • Redness
  • Intense itching
  • Raised patches
  • Small fluid-filled blisters

The rash may appear several hours or even several days after contact, which is why it is not always easy to connect it to a recent outdoor activity. (To learn more about poison ivy, check out our blog article on the subject!)

What should you do after coming into contact with poison ivy?

  • Wash the affected skin with soap and water as soon as possible
  • Wash any clothing, shoes or objects that may have come into contact with the plant
  • Avoid scratching the rash, as this can increase the risk of infection
  • Apply cool compresses to help relieve itching

  1. Insect bites: small bumps, big annoyance

Mosquitoes, black flies, wasps, bees and ticks are among summer’s least welcome visitors.

Most insect bites simply cause:

  • Redness
  • Localised swelling
  • Itching

However, some situations require more attention.

For example, ticks can transmit Lyme disease in certain regions. After spending time in wooded or grassy areas, it is recommended to check your skin—and your children's—for ticks. (To learn everything you need to know about ticks, read our blog article!)

How to relieve an insect bite?

  • Avoid scratching, even if it's tempting
  • Apply a cold compress
  • Use an anti-itch product if needed
  • Keep fingernails short, especially for children, to reduce skin damage caused by scratching

How to help prevent insect bites?

A few simple habits can help:

  • Use an insect repellent containing DEET or icaridin
  • Wear long sleeves and long pants when hiking or spending time in wooded areas
  • Check for ticks after outdoor activities
  • Use a fan while spending time outdoors in the evening, since moving air can help keep some insects away
  • Moisturise your skin if it becomes dry

When you should see a doctor for a skin problem

Most minor skin problems that occur during the summer can be managed with simple at-home care. However, it's best to seek medical advice if:

  • The rash spreads quickly
  • The pain is severe
  • The skin becomes very red, warm or swollen
  • Pus or fluid starts to drain from the affected area
  • Large blisters develop
  • You have a fever along with your skin symptoms
  • Your symptoms continue to worsen despite home treatment

If you're unsure what's causing a rash or another change to your skin, it's always better to seek advice rather than wait for it to get worse.

For a first assessment, you can use BonsAi, Bonjour-santé's free AI-powered health assistant. BonsAi can help you analyse your symptoms, better understand what may be causing them and recommend the next steps. If appropriate, it can also guide you toward booking a medical appointment, or you can search for an appointment directly through the Bonjour-santé platform.

With a Bonjour-santé membership, members can also consult a nurse or a pharmacist by e-consult anytime, without leaving home.

This summer, enjoy the sunshine, your vacation and the great outdoors, while giving your skin the care it deserves!

What's the difference between a heat rash and an allergic skin rash?

Can chlorine cause a skin rash?

When should I see a doctor or pharmacist for a summer skin problem?

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