Dermatology

Dermatology

Coloured Atlas

Acne Vulgaris

Inflammatory papules, pustules, and open comedones.

Acne Vulgaris

Rosacea

Prominent facial erythema, telangiectasia, rhinophyma, and scattered papules. (Courtesy Dr. L. From)

Rosacea

Tinea Capitis

Diffuse area of mild scaling and hair loss. Erythema and pyoderma are occasionally present.

Tinea Capitis

Alopecia Areata

Sharply demarcated, circular patch of hair loss on scalp. Look for “exclamation mark” hairs at the periphery.

Alopecia Areata

Actinic Keratosis – Hand

Hyperkeratotic, erythematous, slightly elevated papules and patches with a rough surface on sun-exposed skin. (Courtesy Dr. S. Walsh)

Actinic Keratosis - Hand

Actinic Keratosis – Head

Hyperkeratotic, erythematous, slightly elevated papules and patches with a rough surface on sun-exposed skin. (Courtesy Dr. C. Forrest)

Actinic Keratosis - Head

Compound Nevus

A domed, regularly bordered, smooth, round, dark brown papule.

Compound Nevus

Epidermal Cyst

Round, firm, yellow/flesh coloured, mobile nodule; may observe a follicular punctum on the overlying epidermal surface.

Epidermal Cyst

Kaposi Sarcoma

Violaceous cutaneous nodules on the lower extremity. (Courtesy Dr. J. Murray)

Kaposi Sarcoma

Keratoacanthoma

Erythematous, skin-coloured, firm, dome-shaped nodule with central keratin-filled crater.

Keratoacanthoma

Lentigo Maligna

Tan/brown, uniformly flat macule with irregular borders. (Courtesy Dr. S. Walsh)

Lentigo Maligna

Seborrheic Keratosis

Well-demarcated, waxy, brownish-black or tan papules/plaques; warty and “stuck-on” appearance.

Seborrheic Keratosis

Stasis Dermatitis

Erythematous scaling patches. May see with hyperpigmentation, swelling, and ulceration. (Courtesy of Dr. L. From)

Stasis Dermatitis

Seborrheic Dermatitis

Greasy yellow-white scales and underlying erythema.

Seborrheic Dermatitis

Contact Dermatitis

Sharply demarcated, weeping and crusting papules and vesicles.

Contact Dermatitis

Atopic Dermatitis

Excoriated, lichenified plaques with erythema, dryness, and crusting.

Atopic Dermatitis

Adult Atopic Dermatitis

Atopic Dermatitis affecting the hands of an adult. (Courtesy Dr. S. Walsh)

Adult Atopic Dermatitis

Urticaria

Circumscribed, raised, edematous, red plaques surrounded by faint white halo. (Courtesy Dr. S. Walsh)

Urticaria

Toxic Epidermal Necrolysis – TEN

Widespread necrosis with painful blistering and denuding of epidermis.

Toxic Epidermal Necrolysis

Erythema Multiforme EM No.2

The macules and papules can have various appearances but tend to be monomorphic in a given patient. (Courtesy Dr. S. Walsh)

Erythema Multiforme EM No.2

Erythema Multiforme EM – No.1

Macules/papules with concentric, light and dark erythematous rings. (Courtesy of Women’s College Hospital Slide Library, Toronto)

Erythema Multiforme EM - No.1

Erythema Nodosum

Tender, poorly demarcated, deep-seated nodules usually on lower extremities. (Courtesy Dr. M. Mian)

Erythema Nodosum

Heritable Disorders

Vitiligo
Sharply marginated, white patches completely devoid of pigment due to an acquired loss of melanocytes.

Vitiligo

Squamous Cell Carcinoma

Indurated erythematous nodule or plaque with a hyperkeratotic surface, scale/crust, and central ulceration.

Squamous Cell Carcinoma

Malignant Melanoma

A pigmented lesion with asymmetry, an irregular border, variegated colour, and diameter greater than 6 mm.

Malignant Melanoma

Basal Cell Carcinoma No. 3

Note central ulceration. (Courtesy Dr. S. Walsh)

Basal Cell Carcinoma No. 3

Basal Cell Carcinoma No. 2

Skin-coloured papule or plaque with rolled, translucent/pearly border and telangiectasia.

Basal Cell Carcinoma No. 2

Basal Cell Carcinoma No. 1

Skin-coloured papule or plaque with rolled, translucent/pearly border and telangiectasia.

Basal Cell Carcinoma No. 1

Nails and Apparatus

Onychomycosis
Distal onycholysis, nail pitting, and subungual hyperkeratosis.

Onychomycosis

Pustular Psoriasis

Deep-seated, dusky-red macules and creamy-yellow pustules progress to hyperkeratotic/crusted papules. (Courtesy Dr. S. Walsh)

Pustular Psoriasis

Psoriasis of the Soles

Well-demarcated, erythematous plaques with thick, yellowish scale and desquamation on sites of pressure arising on the plantar surface of feet. (Courtesy Dr. S. Walsh)

Psoriasis of the Soles

Plaque Psoriasis – Hand

Dry, well-circumscribed, silvery scaling, erythematous papules and plaques. (Courtesy Dr. S. Walsh)

Plaque Psoriasis - Hand

Plaque Psoriasis – Body

Dry, well-circumscribed, silvery scaling, erythematous papules and plaques. (Courtesy Dr. L. From)

Plaque Psoriasis - Body

Lichen Planus

Violaceous, flat-topped polygonal papules on the flexural surface of the wrists. (Courtesy Dr. S. Walsh)

Lichen Planus

Pemphigus Vulgaris

Flaccid vesicles and bullae that easily rupture; erosions and crusts. (Courtesy Dr. S. Walsh)

Pemphigus Vulgaris

Bullous Pemphigoid

Multiple tense serous and partially hemorrhagic bullae; post-inflammatory hyperpigmentation is present at sites of prior lesions. Note the presence of uninvolved skin between lesions. (Courtesy Dr. S. Walsh)

Bullous Pemphigoid