Sun Blister Facts

Sun blisters are a sign of a serious sunburn and are linked to melanoma, the deadliest form of skin cancer.  MedStar Health dermatologists offer the following facts and recommendations about sun blisters.

• Blisters contain a liquid called serum that comes from surrounding tissues 
• Sun blisters can happen on any exposed area of skin 
• Often blisters on the lips after sun exposure are a reactivation of the herpes simplex virus, which is very common. 
• The deeper the blister, the more serious the damage and can last days or even weeks, depending on the severity.  
• Discoloration from a sun blister can last for weeks or even months. 

Sun Blister First Aid Tips

• Don’t pop or open a blister.  The top skin is a good natural bandage and can prevent infection 
• Apply cool compresses or cool water/bath
• Do not apply ice directly which can irritate the skin
• Topical anesthetic medications can be more irritating than helpful
• Apply fragrance-free cream to blisters for relief
• Topical steroids do NOT help sun blisters
• Oral anti-inflammatories like ibuprofen can be helpful if determined to be safe by your doctor

When to call the doctor for sun blisters

• If infection is a concern. Pus or expanding redness can indicate a serious infection.
• If blisters are widespread 
• Fevers
• Chills

Passing out or feeling lightheaded

Source: Medstar Health