What Are Sun Blisters Filled with?

Sunburn blisters form as small bumps on the skin. They are usually white or transparent in appearance and filled with fluid, which can be lymph, serum, plasma, blood, or pus. Most people who get sunburned will find the blisters very painful, particularly if touched or if an item of clothing rubs against them.

How do you treat sun blisters?

To do this, you should:
  1. Drink plenty of water. ...
  2. Place cold, damp compresses on the blisters to take some of the heat out of your skin.
  3. Apply moisturizer with aloe on the burn. ...
  4. Don't pick or pop the blisters. ...
  5. Take ibuprofen (Advil) to reduce swelling and significant discomfort.
  6. Avoid sun exposure until the blisters heal.

What is the fluid in a sun blister?

The clear, watery liquid inside a blister is called serum. It leaks in from neighboring tissues as a reaction to injured skin. If the blister remains unopened, serum can provide natural protection for the skin beneath it. Small blisters are called vesicles.

Marcus Vance

Marcus Vance

Cybersecurity & Digital Privacy Researcher

Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.