Cutaneous diphtheria: what to know

The infection may cause a slow-healing sore, ulcer, crust or greyish coating, with redness, swelling or discharge around it. Some people have few symptoms beyond the wound. The bacteria can spread through contact with infected skin or contaminated dressings. Cutaneous infection is different from throat diphtheria, although throat symptoms such as a sore throat need urgent attention because diphtheria can affect more than the skin.

Contact a clinician promptly about a suspicious or non-healing wound, especially after travel or close contact with someone who has a similar infection. Cover the area, wash hands carefully, avoid sharing towels, and dispose of dressings safely according to medical advice. Do not pick the coating or use leftover medicine. A clinician may take a swab and arrange antibiotic treatment, while public-health advice may be needed for close contacts. Check whether childhood immunisation and adult booster protection are up to date.

Seek urgent help for trouble breathing or swallowing, a sore throat with marked weakness, facial or neck swelling, confusion, fainting, rapidly spreading redness or fever. Keep the wound covered and mention possible diphtheria when arranging care so staff can advise on precautions.

Ask whether the wound needs a swab, which treatment is appropriate, how long contact precautions should continue, whether household contacts need assessment, and whether your immunisation record needs review.