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Dermatology · Bacterial skin infections

Infected skin ulcer

An infected skin ulcer is a chronic wound, such as a leg ulcer, a pressure sore or a diabetic foot wound, in which bacteria multiply and invade the tissues. The bacteria are most often staphylococci, streptococci or Pseudomonas. Infection shows as spreading redness, local warmth, increased pain, a purulent or foul-smelling discharge and delayed healing. Without appropriate treatment, it can reach the deeper tissues or become generalised.

Written by Dr A. Turcarelli, dermatologist and allergist Updated 4 January 2026 6 min read

Ulcère cutané infecté

Introduction

Bacterial intertrigo is a skin infection of the body folds, encouraged by moisture, friction and dampness. It occurs mainly where skin rubs against skin (groin, between the buttocks, under the breasts, armpits). Bacteria, most often streptococci or staphylococci, multiply on weakened skin, causing local inflammation that can be painful.

Symptoms

  • Bright, well-defined redness in the skin folds
  • Local burning or pain
  • Soggy (macerated) skin
  • Possible oozing
  • Cracks or superficial erosions
  • Sometimes an unpleasant smell
  • Variable itching
  • Possible spread to neighbouring areas

Causes

Bacterial overgrowth on macerated skin
Contributing factors
excessive sweating repeated friction obesity diabetes wearing tight or synthetic clothing
excessive sweating
repeated friction
obesity
diabetes
wearing tight or synthetic clothing
Possible secondary infection of an initially non-infectious intertrigo

Diagnosis

  1. Diagnosis is essentially clinical
  2. Examination of the affected folds
  3. Bacterial swab in the event of: treatment failure recurrent forms diagnostic doubt (bacterial vs fungal)
  4. treatment failure
  5. recurrent forms
  6. diagnostic doubt (bacterial vs fungal)
  7. Differential diagnosis with: fungal intertrigo inverse psoriasis contact dermatitis
  8. fungal intertrigo
  9. inverse psoriasis
  10. contact dermatitis

Treatments

Mild antiseptics
Appropriate topical antibiotics
Protective barrier creams after the acute phase
Oral antibiotics for extensive or resistant forms
Careful drying of skin folds
Reducing friction
Loose cotton clothing
Weight loss if needed
No instrument-based dermatological technology
Conventional medical care

Management

Personalised dermatological care

Identifying and correcting contributing factors

Preventing recurrences with appropriate hygiene measures

Follow-up for chronic or recurrent forms

Frequently asked questions

Consultation for an infected skin ulcer

Consultation with a confirmed diagnosis and a written treatment plan.

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