Lecture 5 Common Skin Infections Marcella Debeck

Common Skin Infections  Impetigo  Ecthyma  Folliculitis  Erysipelas  Necrotising fasciitis  Erythrasma  Pitted Keratolysis  Cellulitis  onychomycosis  Lymphaginitis  Molloscum Contagiosum  Verrucae  Herpes simplex  Herpes zoster  Dermatophyte infections  candida albican infection

Impetigo  Superficial skin infection  due to staphylococci or streptococci infections  Contagious  blisters which rupture leaving yellow crusted exudate  Two types

Bullous Impetigo

Ecthyma  Strep. Or Staph. Infection  circumscribed, ulcerated and crusted lesions  heal with scarring  mostly in legs

Ecthyma

Folliculitis  Infection of the hair follicles  any hairy area

Erysipelas  Dermal infection  May be accompanied by systemic symptoms - malaise, shivering, fever  well defined advancing edge  AKA St Anthony’s fire

Erysipelas

Necrotising fascitis  very serious  bacterial infection of the superficial fascia  progresses very quickly

Erythrasma  Dry, reddish brown, slightly scaly and asymptomatic eruption  wood’s light - coral-pink  imidazole cream, oral ab’s, fusidic acid  Toe webs

Slide 2 Dockery, G.L. (1997).

Cutaneous Disorders of the lower extremity.

Phila delphia:WB Saunders

Pitted Keratolysis  maloderous, pitted erosions and discoloured areas.

 cornebacterium

Cellulitis  Infection of the subcutaneous tissues  deeper and more extensive than erysipelas  systemic symptoms  swelling, redness, and local pain  antibiotics

Lymphaginitis  inflammation of the lymph vessels appearance of a red line that follows the blood vessels up the leg  Lymphadenitis - inflammation of the lymph nodes

Molluscum contagiosum  discrete pearly, pink, umbilicated dome shaped papules  DNA pox virus  contain a cheesy material  face, neck and trunk  usually multiple and grouped

Verrucae Vs Corns Rapid Onset Any site Young Superficial cappillaries which bleed easily Slow growing Sites of compression and friction Middle aged and older Capillary bleeding is rare

Herpes Simplex  Acute vesicular eruption  two virus types  reoccurence  Differential diagnosis: impetigo

Herpes

Slide 3 Dockery, G.L. (1997).

Cutaneous Disorders of the lower extremity.

Philadelphia:WB Saunders

Herpes Zoster  Varicella zoster virus  Dermatomal distribution  Post herpetic neuralgia  rest, analgesia, drying lotions  acyclovar and prednisone

Slide 7 Gawkrodger, D. J. (1992)

Dermatology.

London: Churchill Livingstone

Dermatophyte infections  Microsporum  Trichopyton  Epidermophyton  Form hyphae  Tinea Pedis: T.rubrum, Tmentagrophytes var interdigitale, Epidermophyton floccosum

Dermatophyte infections  Differential diagnosis: – Psoriasis – Contact dermatitis – erythrasma

Tinea pedis  Interdigital  moccasin  acute vesicular

Interdigital tinea pedis

Slide 3 Gawkrodger, D. J. (1992)

Dermatology.

London: Churchill Livingstone

Tinea pedis

Candida albicans infections  yeasts  intertrigo  paronychia  Differential diagnosis (intertrigo) – Psoriasis, seborrhoeic dermatitis, bacterial seconadary infection  Differential diagnosis (Paronychia): – bacterial infection, chronic eczema:

Slide 1 Dockery, G.L. (1997).

Cutaneous Disorders of the lower extremity.

Philadelphia:WB Saunders

Candida Paronychia

Onychomycosis  Fungal Infection of the nails  generally dermatophyte  occasionally mould or candiida  Four types: – distal and lateral subungual – superficial white – proximal subungual – total dystrophic

Slide 7 Gawkrodger, D. J. (1992)

Dermatology.

London: Churchill Livingstone