Blister (bulla)

A blister (medical term bulla; small blisters are called vesicles) forms when the upper layers of the skin separate due to friction and the space fills with tissue fluid. The blister roof protects the sensitive skin underneath.

Common causes on the foot

• new shoes that have not been broken in
• damp feet and slipping socks
• seams or folds in socks
• long hikes, sport

Caring for it correctly

• if possible, do not pierce the blister – the skin is the best protection
• cover with a blister plaster (hydrocolloid) and avoid pressure
• if it is already open: disinfect and cover with a sterile dressing
• see a doctor if there is redness, warmth or pus

With diabetes

With diabetes or nerve damage, a blister often goes unnoticed. Every blister should then be checked by a doctor so that no ulcer develops. Prevention tips in our guide The right shoe.