Skins – starting off Dr Bruce Davies You are not alone! Every registrar wants to talk about this! From all countries and medical schools! Which says.

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Presentation transcript:

Skins – starting off Dr Bruce Davies

You are not alone! Every registrar wants to talk about this! From all countries and medical schools! Which says something!

Introduction If you can make the diagnosis you are there! Most people try and do pattern recognition and when that fails are confused and lost A systematic approach enables most diagnoses to be made Dermatology is no different from other things but there are some special points

Summary History Examination Dermatological Pharmacology Nomenclature Investigations Definitions

History - 1 Time When - did it start, how long Where - did it start, is it now Spread Course - episodic, previous rashes, continuous

History - 2 Description Patients description - distribution, shape, size, previous variation Symptoms Itch - think of scabies, lice, eczema, urticaria, exanthemata, psoriasis, dermatitis herpetiformis Pain

History 3 Symptoms Weeping/bleeding Provoking factors - environment, sunlight, temporal, drugs, temperature, occupation, hobbies Relieving factors - as above treatment including OTC

History - 4 Symptoms of associated structures Mucous membranes Scalp Nails General Family, Contact, occupation PMHx, Drug use, Atopy, bowels, joints

Examination Knowing what the special dermatology morphological words mean is half the story Distribution Symmetry Area affected - exposed, seborrheic, gravitational, napkin, dermatomal Pattern - linear, clustered

Examination - 2 Morphology Primary lesion - Macule, papule, nodule, pustule, vesicle, bulla, weal, plaque Size Colour / shine Surface - scale, lichenification, exudate, ulceration. Edge - regularity, distinctiveness Associated features - Telangiectasis, vascularity, purpura, excoriation, scarring, involvement of hair follicles

Examination 3 Related structures Hair / scalp Nails Mucous membranes Other structures as relevant E.g. lymph glands, joints etc

Investigation Ultraviolet light: Fungal specimens: how much, scrapings and clippings Biopsy: special points, difficulties of dermal histopathology

Definitions Macule From the Latin for a stain. Any change in colour or consistency, without elevation above the surface of surrounding skin. Does not blanch on pressure. Papule Circumscribed raised lesion <1cm in diameter. Nodule Circumscribed raised lesion >1cm in diameter. A rash may be a mixture, hence "macular papular rash" etc.

Definitions - 2 Plaque Think of a commemorative plaque stuck on the wall of a building. An area of skin raised slightly above the surrounding skin which is extensive, usually greater than 3cm across. Think of psoriasis.

Definitions - 3 Vesicles Circumscribed raised lesions containing clear fluid. <0.5cm in diameter. Pustules Circumscribed raised lesions containing cloudy fluid. <0.5cm in diameter. Not necessarily infected. Bullae Circumscribed raised lesions containing clear fluid. >0.5cm in diameter. CF "pustular bullae" Can you "roll" it - i.e. push it, if you can its superficial as in superficial scalds, or deep seated when you can't move it. Cyst A fluid filled cavity below the dermis. The above lesions are in the dermis

Definitions - 4 Nummular / Discoid From Latin for coins and discs. No real distinction. Flat disc like lesions of various sizes.

Definitions - 5 Erythema From the Latin for redness, Dilatation of the superficial skin capillaries, causing redness. Always blanches. Purpura Damage to superficial skin capillaries that have leaked blood. Do not blanch. Angioma A tumour of blood vessels. Blanch, circumscribed. Telangiectasia Small permanently dilated blood vessels in the skin. Blanch, linear.

Definitions - 6 Erosion An area of partial loss of the dermis or mucous membrane Ulcer An area of full loss of the dermis or mucous membrane. Fissure A crack or split in the dermis

Definitions - 7 Excoriation Scoring of the dermis from abrasion - usually scratching. Lichenification Hard thickening of the skin, with exaggerated skin markings, folds and creases.

Definitions - 8 Crust Dried serum Scale Excessive accumulation of keratin on the skin

Definitions - 8 Xeroderma Dry skin Icthyosis From the Latin for fish. Excessively dry skin, scaly. Beau's lines Transverse lines on the nails after acute illness Pompholyx Blistering form of eczema may be vesicular or pustular. Podo for soles and cheiro- for palms.

Dermatological pharmacology The introductory section of chapter 13 of BNF is compulsory reading! Potency The steroid ladder The maximum absolute effect, nothing to do with dilution, or vehicle. Value of getting to know own "ladder"

Least occlusiveVehicles The ladder of how occlusive it is. Most occlusivePlastic or plastic backed dressings Bandages Pastes Ointments "Lipocreams" Creams Lotions Solutions or "Applications"

Expients Positive and negative effects Moisturisers, Emollients and bath additives The theory of and how they work.

White no sugar thanks