When to worry about skin blisters with sunburn

A blister forms when sun-damaged skin separates and fluid collects beneath its surface. Blisters can be tender, tight, or itchy, and nearby skin may feel hot and red. The fluid-filled roof helps shield the raw layer underneath, so leaving it intact can reduce irritation and contamination.

Sunburn can affect a large area without every part blistering. The depth of injury is not judged by appearance alone, especially if pain becomes intense, the skin looks pale or numb, or symptoms continue to worsen.

Move out of direct sun and cool the area with a clean, damp cloth or a cool bath. Drink fluids, wear loose clothing, and avoid rubbing, peeling, or deliberately opening blisters. Keep the skin clean and covered with a non-stick dressing if clothing catches on it.

Do not apply ice directly, butter, or harsh antiseptics to the burn. A pharmacist or clinician can advise on suitable pain relief and dressings, particularly if the area is large or difficult to protect.

Seek prompt medical care for blistering over a wide area, blisters on the face, hands, feet, or genitals, severe pain, fever, chills, vomiting, dizziness, confusion, or signs of dehydration. Get urgent help for trouble breathing, fainting, or confusion. Redness that spreads, increasing warmth, pus, or worsening tenderness may indicate infection and also warrants assessment.

Ask whether the burn needs a specific dressing, how to control pain safely, and how to recognise infection while it heals. Ask when you can return to sun exposure and whether any medicines you take make sun sensitivity more likely.