DERMATOLOGY

BACTERIAL & VIRAL

INFECTIONS

OF THE SKIN

FOLLICULITIS

Staph aureus

Superficial erythematous papules & crusts of hair follicles in the beard area.

Condition was chronic, aggravated by shaving.

FOLLICULITIS

FOLLICULITIS

Pseudomonas aeruginosa

Multiple follicular pustules are present on the trunk, appearing 3 days after bathing in a hot tub.

P. aeruginosa isolated on culture from a lesion. Lesions resolved spontaneously within a week.

FURUNCLE

Staph aureus

A painful abscess with associated facial edema in an otherwise healthy 25-year-old male.

The patient felt systemically ill. The infection resolved with oral dicloxacillin.

FURUNCLE

CARBUNCLEStaph aureus - Large, inflammatory plaque studded with multiple pustules, some have ruptured, draining pus, on the nape of the

neck. This very painful area is surrounded by erythema and edema, extends down to fascia, formed from a confluence of many furuncles.

CARBUNCLE

HIDRADENITIS SUPPURATIVA

Many comedones, some of which are paired, are a characteristic finding, associated with several deep exquisitely painful

abscesses and old scars in the axilla.

HIDRADENITIS SUPPURATIVA

IMPETIGO

Staph aureus

Crusted erosions on the arm of a child.

The confluence of lesions in the antecubital fossa suggests prior atopic dermatitis at the site that became secondarily infected.

IMPETIGO

BULLOUS IMPETIGOStaph aureus

A large, single bulla with surrounding erythema and edema on the thumb of a child; the bulla has ruptured only in the center and clear serum exudes from it.

BULLOUS IMPETIGO

ERYSIPELAS

Group A streptococcus

Painful, shiny, erythematous, edematous plaques involving eyelids, cheeks, and the nose of an elderly febrile male.

On palpation the skin is hot and tender. Portal of entry was conjunctivitis.

CELLULITIS

Staph aureus

Portal of entry of infection is seen on the lateral thigh with necrosis of skin; infection has extended mainly proximally from this site.

CELLULITIS

NECROTIZING FASCIITIS

VERRUCAVerruca vulgaris: Hyperkeratotic papules located on dorsum of a finger. Similar lesions were present on all fingers of both hands.

VERRUCA

Verruca plantaris: Confluent, skin-colored, verrucous papules, disrupting normal dermatoglyphics of the plantar foot. The thrombosed capillaries differentiate the lesion from a corn & callus.

CONDYLOMA ACUMINATUM

Multiple, soft papules, discrete with some

coalescing to raspberry-like lesions, on the

glans penis and prepuce.

Multiple, pink-brown, soft papules

on the labia

HERPES VIRUS

Primary gingivostomatitis: Multiple, very painful erosions on the lower labial mucosa with erythema and edema of the gingiva. Fever and tender submandibular LAD also present

HERPES VIRUS

Recurrent herpes labialis:Grouped and confluent vesicles with an erythematous rim on the lips, 24 h after onset of symptoms

HERPES VIRUS

Recurrent infection of the penis: Group of vesicles with early central crusting on a red base arising on the shaft of the penis.

Recurrent vulvar infection:Large painful erosions on the labia

VARICELLA VIRUS

Chicken pox - Multiple, pruritic, erythematous papules, vesicles ("dewdrops on a rose petal"), & crusts on erythematous bases on face and neck of a young female. The spectrum of lesions, arising over 7 to 10 days.

VARICELLA VIRUS

Zoster - T8 to T10 dermatomes Typical grouped vesicles and pustules with erythema and edema of three contiguous thoracic dermatomes on the posterior chest wall.

MOLLUSCUM CONTAGIOSUM

Discrete, solid, skin-colored papules, 1 to 2 mm diameter, with central umbilication on the chest of an adolescent female.

The lesion with an erythematous halo is undergoing spontaneous regression.

PITYRIASIS ROSEA

Herald patch

Christmas tree pattern

PITYRIASIS ROSEA