What should you know about bullous impetigo on legs?

Bullous impetigo is caused by bacteria affecting the upper layers of skin. The blisters may look clear, yellow, or cloudy, and their thin roofs can rupture with rubbing or scratching. After a blister breaks, the area may be red, wet, and covered by a yellow-brown crust. Several spots can appear on the lower legs or spread to nearby skin through touch, fluid, or shared towels.

The infection can occur on previously healthy skin, but cuts, insect bites, eczema, or other irritated areas may make it easier for bacteria to enter. It is not the same as every blistering rash, so a clinician may examine the pattern and ask how quickly it developed before choosing treatment.

Arrange a medical review, especially when blisters are multiplying, breaking, or producing drainage. Keep the affected skin gently clean and dry, avoid picking at crusts, and cover open areas with a clean, loose dressing if they are rubbing against clothing. Wash hands after touching the rash and do not share towels, clothing, bedding, or razors. Launder items that contact the area, and keep fingernails short to reduce skin damage from scratching.

A clinician may recommend a topical antibiotic for a limited area or an oral antibiotic when the infection is more extensive or difficult to manage locally. Use the prescribed medicine exactly as directed and do not apply leftover antibiotics or strong steroid creams without advice.

Seek urgent medical help if the skin becomes rapidly more painful, hot, swollen, or red; if redness is spreading; or if fever, marked weakness, confusion, or reduced urination develops. Prompt assessment is also needed when a child seems unwell, the rash involves the face or eyes, or the person has a weakened immune system. These signs can indicate a more serious infection or dehydration and should not be judged by the number of blisters alone.

Ask which type of impetigo is most likely, whether a swab is needed, how long the prescribed treatment should be used, and how to protect household members from spread. Mention recent eczema, bites, wounds, new products, or contact with someone who has a similar rash.