1. Lecture 5 Common Skin Infections
Marcella Debeck

2. 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

3. Impetigo Superficial skin infection
due to staphylococci or streptococci infections
Contagious
blisters which rupture leaving yellow crusted exudate
Two types
Antibiotics - topical or systemic
carriers - nose, axillae, perineum
may be primary or secondary

4. Bullous Impetigo

5. Ecthyma Strep. Or Staph. Infection
circumscribed, ulcerated and crusted lesions
heal with scarring
mostly in legs
Associated with drug addicts
generally insect bite or neglected minor injury
ab’s

6. Ecthyma

7. Folliculitis Infection of the hair follicles any hairy area
Follicul9itis - multiple hair follicles
furuncle acute abcess formation\carbuncle - deep abcess formed in a group of follicles
associated with obesity, diabetes, occlusion,
improved hygiene

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

9. Erysipelas

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

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

12. Slide 2
Dockery, G.L. (1997).Cutaneous Disorders of the lower extremity. Phila
delphia:WB Saunders

13. Pitted Keratolysis maloderous, pitted erosions and discoloured areas.
cornebacterium

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

15. 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

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

17. Verrucae Vs Corns

18. Herpes Simplex Acute vesicular eruption two virus types reoccurence
Differential diagnosis: impetigo
Type 1 facial/non genital
type 2 genital

19. Herpes

20. Slide 3
Dockery, G.L. (1997).Cutaneous Disorders of the lower extremity. Philadelphia:WB Saunders

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

22. Slide 7
Gawkrodger, D. J. (1992) Dermatology. London: Churchill Livingstone

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

24. Dermatophyte infections
Differential diagnosis:
Psoriasis
Contact dermatitis
erythrasma

25. Tinea pedis
Interdigital
moccasin
acute vesicular

26. Interdigital tinea pedis

27. Slide 3
Gawkrodger, D. J. (1992) Dermatology. London: Churchill Livingstone

28. Tinea pedis

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

30. Slide 1
Dockery, G.L. (1997).Cutaneous Disorders of the lower extremity. Philadelphia:WB Saunders

31. Candida Paronychia

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

33. Slide 7
Gawkrodger, D. J. (1992) Dermatology. London: Churchill Livingstone