dermatology revision

Clinical dermatology

Carmen I Farid. MD.

Herpes Zoster

Vesicles on erythematous base

Healing by either :-Normal skin - posteruptive hyperpigmentaion

Psoriasis Well defined dusky red plaques with silvery white lamellated scales

It may shows +ve auspitz sign+ve kobner’s sign

Possible sites : Extensor aspect of limbs Scalp Back

The specific lesion on the nail is Oil spots

Mucous membrane involvement is evident in Erythrodermic psoriasis

Causes of silvery lips :1- DLE2- Lichen planus 3- psoriasis

Planter hyperkeratosis

DDLichen planus Psoriasis T. Rubra T. Pedis

Kobner’s Phenomena

Possible questions

Definition

Lesions that shows Kobner’s phenomena

Ptyriasis Rosea

Herald patch

Lichen planus

Hypertrophic type

On the chin of Tibia

Glistening surface

Treatment Intrlesional corticosteroids

Lichen planus on the hand

Well defined , glistening , wickham’s striae

DDwarts ( rough mamilated surface )

Urticaria

Weals , erythema , elevated

Erythema Multiform

Target lesions Indicative for erythema multiform

Sever Inflammatory Acne Vulgaris

Indication for systemic retinoids

Post acne scars Atrophic in nature

Alopecia areata

Alopecia areata

Exclamation mark

! Means > progressive Alopecia

Erythrasma

Woods light

Favus

Causative organismTrichophyton schoenleinii

Diagnostic lesion Scutulum ( it is crust )

Vesiculo bullous lesions of infant sole

Toe web maceration

DD of Vesiculo bullous lesions of infant sole (4)1- T. paedis 2- Eczema 3- Infantile scabies 4- dermatolysis bullous

T. Cruris

Crural lesions 1- Inverted psoriasis 2- Erythrasma 3- Monilial 4- intertrigo 5- T. cruris

T. Cercinata

Condyloma accuminata

Herpes zoster

Koebner’s

Herpes simplex

Herpes simplex

Bullous impetigo

impetigo

impetigo

Ichthyosis vulgaris

Vitiligo

T. cercinata

Impetigo

Molluscum contagiusum

Verruca plana

Normal Skin

Spongiosis

Bullae

Vesicle

Suprabasal acantholysis

Subepidermal separation

Alopecia areata

Black dot (t. Capitis)

t. Capitis

Ecthyma

Erythrasma

Herpes Zoster

Herpes Zoster

Herpes Simplex

Lichen planus

Molluscum contagiusum

Parakeratosis

+ RBCs on surface = bleeding

Suprabasal acantholysis

T. Cruris

Ptyriasis versicolour

Hypopigmented type

Ichthyosis vulgaris

Ichthyosis vulgaris

Ichthyosis vulgaris

Verruca vulgaris

Verruca plana

Verruca vulgaris

Tinea circinata

Scabies (tunnels)

Contact dermatitis

Contact dermatitis

Atopic dermatitis

Atopic dermatitis

Contact dermatitis

Onychomycosis

Onychomycosis

Pemphigus vulgaris

Pemphigus vulgaris +

Crustations

Bulla spreading test

Ptyriasis versicolour

Hypopigmented type

Ptyriasis versicolour

Hypopigmented type

Ptyriasis Rubra Pilaris

-Follicular hyperkeratosis-Erythema -Scaly patch on the trunk-Scaly scalp -Palm and Sole keratoderma -Nail dystrophy

Leprosy (LL)

Leprosy (LL)

Xeroderma pigmentosum

Xeroderma pigmentosum

Favus