Why does sunburn cause skin blisters?

Skin Blisters is a common presentation of Sunburn. A blister is the skin's protective response to deeper surface injury; the fluid-filled space cushions damaged tissue while it begins to heal. Blisters may occur with redness, warmth, swelling, soreness, or peeling. Their presence suggests more than mild irritation, particularly when they cover a broad area or occur with headache, nausea, dizziness, fever, or weakness. Other causes of blisters include friction, allergy, infection, and medication reactions, so appearance and context matter.

Cool the area with a clean, damp cloth or a cool shower, then pat dry. Keep blisters intact because the roof helps protect the raw skin underneath. Cover loosely with a clean non-stick dressing if clothing rubs, and drink fluids. Do not pierce, peel, or apply ice, butter, or irritating products. A pharmacist or clinician can advise on suitable pain relief for you, considering your health and medicines.

Seek medical care for extensive blistering, severe pain, dehydration symptoms, confusion, faintness, repeated vomiting, breathing difficulty, or signs of infection such as spreading redness, pus, or worsening warmth. Prompt assessment is also sensible for blistering on the face, hands, feet, or genitals, or after exposure in a child or frail adult.

How should I dress this blister? What pain-relief options are suitable with my medicines? Does the area need treatment for infection? How can I prevent another severe sunburn?