Dermatology Atlas
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![Page 1: Dermatology Atlas](https://reader035.fdocuments.net/reader035/viewer/2022062412/58742b871a28ab72188b657f/html5/thumbnails/1.jpg)
Sarah Wood
![Page 2: Dermatology Atlas](https://reader035.fdocuments.net/reader035/viewer/2022062412/58742b871a28ab72188b657f/html5/thumbnails/2.jpg)
Acute Wounds
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Wound HealingKeloid scars:(children, young adults, genetics, black skin). No improvement with time. Can continue to enlarge. Overgrowth of dense fibrous tissue. HLA associated. No hair follicles or sweat glands on scar. Overgrows margins of original wound. Starts red, becomes pale or brown. Options for Tx: occlusive dressings, intralesional corticosteroid injections, compressive dressings, cryosurgery, radiation, laser.
Hypertrophic Scars:
Lumpy within the confines of the wound. Elevated, rarely painful, regresses spontaneously.
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Acute Wounds - burns
1st degree – extend to epidermis of upper dermal layer only. Very painful, dead skin can peal.
3rd degree – skin = black, brown, yellow, red or white. Burn reaches subcut fat. Pain minimal – nerve endings almost all destroyed. No blistering, but hard, inelastic eschar
2nd degree – extends to deeper dermal layers, can blister, more moderate pain (damage to nerve endings.)
Fourth degree – the most serious. Reaches underlying fascia, can affect bone and tendons.no oedema, lots of eschar. Pain minimal.
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Chronic Wounds
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Venous Ulcers• Venous Ulcers – indicate severe venous
insufficiency. (valve incompetence, increased hydrostatic pressure and capillary permeability, increased pericapillary fibrin deposition.) 80% of leg ulcers. Think about RFs. Haemosiderin, telangectasia, atrophie blanche, eczema, lipodermatosclerosis, ulceration
Atrophie blanche with haemosiderin deposition
telangectasia
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Neuropathic Ulcers• Frequently seen in diabetes, decreased
sensation, loss of autonomic function, anhidrosis, loss of intrinsic muscle function. Ulcers typically wet and deep. Often on pressure points and surrounded by callous. Tx: off-load weight, MDT, patient compliance, glucose control.
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Arterial Ulcers• Usually below ankle. Look for signs of
decreased blood flow – cooler, hair loss, thin and shiny skin, dependant rubor, thick nails, reduced or absent pulses. Ulcers are typically small, distal with steep “cliff edge” and a dry bottom. Pain at night when leg elevated. Patient can have intermittent claudication. Tx: restore blood flow! Stop smoking! Control RFs (eg hypertension), NO compression.
Mixed arterial and venous ulcer
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Photoaging and Skin Tumours
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Photoaging (chronic sun exposure)
• Course, wrinkled, pale-yellow skin
• Telangectasia• Irregular pigmentation• Prone to purpura• Benign and malignant skin
tumours.
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Bengin Epidermal Tumours
Actinic (solar) Keratoses
Solar (senile) Lentigos (“age spots”)
Seborrheic Keratoses (“seb warts”)
Skin Tags Epidermal Cyst
Milia
Melanocytic naevi
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Benign Dermal Tumours
Dermatofibroma (commoner in females, can be a reaction to trauma
Campbell de Morgan spots (cherry angiomas)
Haemangioma
Pyogenic granuloma Chondrodermatitis nodularis
Intradermal Naevus
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Low Grade Malignant TumoursBowen’s Disease (intraepidermal carcinoma, squamous carcinoma in situ). Can look like infection to start with.
Keratocanthoma – benign techincally? but can look like squamous carcinoma, so biopsy! Papular lesion with central umbilicated keratinous core.
Lentigo Maligna (Hutchinson’s melanotic freckle). Light brown with development of darker areas. Can turn into cancer later in life. Flat (macular) and when invades dermal layer, becomes lentigo maligna melanoma.
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Malignant Skin Tumours• 1) Basal Cell Carcinoma – commonest. Rarely spreads.
Most are painless, history of sun exposure. Biopsy! Proliferation of atypical basal cells. Often clefts between tumour and dermis. Slow growing. Rolled-in edge, telangectasia, or nodular, or pigmented, pearly appearance.
• 2) Squamous Cell Carcinoma
Malignant tumour of epithelial keratinocytes – skin and mucous membranes. Sun exposure = major RF. Persists and grows. Can be solitary, keratotic or eroded, papular or nodular. Can arise from actinic keratoses. Lymph spread. Old men.
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Pigmented Skin Lesions
Benign melanocytic naevus “mole” Seborrheic keratosis
• 3) Cutaneous T-cell lymphoma (mycosis fungoides)
Rare. Uncontrolled t-cell growth in the skin.
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4) Malignant Melanoma
Questions:
How long have you had it? Has it changed? Over what period of time? Larger? Changed in colour or shape? Has it become itchy?
Facts:
Incidence = 10/100k/year (increasing 7% each year) F:M = 2:1 (equal in hot countries). Commonest sites = lower leg in women, back in men. Pre-existing naevus in 30%.
RFs: Previous Hx, FHx, Red hair, blue eyes, multiple melanocytic naevi, congential naevus.
Is it worrying? Breslow thickness (depth) and Clarks level (where it is in dermis in relation to other structures).
Prevention: SLIP, SLAP, SLOP! Report changes early.
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Skin Manefestations of Systemic Diseases and Drug
Eruptions
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Vasculitis!• 1) Henoch-Schonlein Purpura necrotising vasculitis of small vessels. Children. Palpable
purpuric rash, arthritis, haematuria, bowel angina and ischaemia. Post strep throat inf = most common.
• 2) Polyarteritis Nodosa rare, autoimmune, necrotising vasculitis of medium vessels.
Middle aged me. Renal failure, CHS, Cardiac involvement, pulmonary, GI, blood. Subcut nodules. Livedo Reticularis p-ANCA and ANA negative. Tends to follow artery lines. Can ulcerate and become necrotic. Common post HepB
• 3) Wegener’s Granulomatosis granulomatous vasculitis. URT and LRT, renal involvement,
arthritis, c-ANCA +ve. Saddle-shaped deformity. M>F
Tx: find and treat cause and systemic involvement. Pred/immunosupression, dapsone for cutaneous involvement.
1
2
3
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Erythema Nodosum• Inflammation of subcut fat causing
painful red nodules on the legs• Causes: 20% idiopathic, infection
(strep, TB), drugs (OCP), systemic diseases (IBD, Sarcoidosis)
• Tx: rest, analgesia, treat underlying cause
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Erythema Multiforme• Reaction of dermal vessels
resulting in changes – papular and vesicobullous eruptions, TARGET-LIKE LESIONS!.
• Palms, soles, mucosal membranes
• If severe, “Stevens-Johnson Syndrome”
• Causes: 50% idiopathic. HSV, Strep, pregnancy, SLE, drugs (sulphonamides, phenytoin, barbituates, penicillin, allopurinol)
• Tx: Treat cause. Symptomatic care (analgesia, IV fluids if unable to drink etc)
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Pyoderma Gangrenosum• Rapidly progressing ulcer,
often with erythematous to violaceous undermined edge. Can occur at site of trauma/surgical wound
• Causes: 50% idiopathic.• Associated with: RA, IBD,
Haematological malignancy, trauma
• Tx: Systemic steroids, immunosuppression.
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Connective Tissue Diseases
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SLE – Cutaneous Manifestations:
• Photosensitvity• Malar Rash• Raynauds
Phenomenon• SLE Vasculitis• Alopecia (typically
scarring)
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• * Subacute cutaneous lupus erythematosus *
Positive autoantibodies, widespread rash, well defined, can get everywhere on body, photosensitive. Other body systems can be involved – heart (pericarditis), lungs (pneumonitis), CNS.
• * Discoid Lupus Erythematosus *
autoantibodies usually negative (<20% ANA). Only 5% develop SLE. Discoid lesions on sun-exposed sites. Scarring alopeica.
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Systemic Sclerosis• Autoantibodies positive: Scl-
70, centromere antibodies. • F:M = 4:1• Proximal skin sclerosis and
any 2 of: sclerodactyly, digital pitting scars, pulp loss and bi-basal lung fibrosis
• CREST Syndrome has less internal involvment and a better prognosis (Calcinosis, Raynauds, Oesophageal stricture, sclerodactyly, telangectasia)
calcinosis
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Morphea• Localised fibrotic plaques, atrophic changes, self-limiting,
no internal involvment. Localised cutaneous sclerosis. Indurated plaques with erythematous edge or brown macules. F:M = 3:1.
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Dermatomyositis• Spectrum of disease• Polymyositis: high CK, CRP• Jo-1 Antibodies• 60% ANA positive• Photosensitive rash• Heliotrope (purple) changes
on face• Red papules on dorsa of
hands and fingers (gottron’s papules)
• If >55yrs, associated with malignancy – breast, lung, stomach, uterus, colon
Heliotrope rash
Gottron’s papules
Muscle biopsy: pink muscle cells being attacked by inflammatory cells
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Manifestations of Malignancy, Endocrine Conditions, and Drug
Eruptions
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Manifestations of MalignancyAcanthosis Nigricans: typically neck and axillae. Papillomatous. Associated with GI malignancy.
Pagets Disease of the Nipple: associated with Breast Ca, suspect if unilateral breast eczema.
Secondary Cutaneous Metastases: various. Present late, represents poor prognosis. Usually scalp, trunk, umbilicus.
Erythema Gyratum Repens: associated with Lung Ca.
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Cutaneous Manifestations of Endocrine Disease
HYPERPIGMENTATION: Addisons, pregnancy, Cushings
VITILIGO: Addisons, organ specific autoimmunes, DM, thyroid disease
HIRSUITISM: Cushings, PCOS
GRANULOMA ANNULARE: generalised in IDDM
NECROBIOSIS LIPIODICA: IDDM
PRETIBIAL MYXOEDEMA: Grave’s Disease
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Drug Eruptions• Almost all drugs can cause rashes. Certain ones more likely to cause a certain
pattern. 2-3% of hospitalised patients. Ask about drugs started in the last 2-3 weeks, inc. OTCs.
Erythema Mobilliform: eg. amoxicillin
Fixed Drug Eruption: eg. Streptomycin, cephs.
Generalised Fixed Drug Eruption: eg. Anticonvulsants, aspirin, NSAIDS, phenobarbs, doxycycline, metronidazole etc etc.
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Hypersensitivty Reactions:• Type I: IgE mediated. Causes Urticaria, angioedema,
anaphylaxis• Type II: cytotoxic leading to haemolysis, purpura.• Type III: immune comples reaction, resulting in
vasculitis, serum sickness, urticaria• Type IV: delayed-type reaction with cell-mediated
hypersensitivity resulting in contact dermatitis, exanthematous reactions, photoallergic reactions.
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TEN – Toxic Epidermal Necrolysis• Erythema-multiforme =>
Steven-Johnsons Syndrome => toxic epidermal necrolysis
• Allopurinol, Anticonvulsants, aspirin, isoniazid, sulphonamides, penicillins. (can also be cause by things like infection! herpies especially.)
• Fever, chills, headache, D&V, no pruritis. Can get mouth involvment/GU involvment.
• Macules => papules, vesicules, bullae, uritcarial plaques, erythema.
• TEN: Muco-cutaneous detatchement. Burns unit.
• TEN: up to 30% die
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Eczema
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Exogenous (contact) Eczema
• 1) Irritant
• 2) Allergic
• 3) Photodermatitis
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Endogenous and Mixed Eczema
• 1) Atopic Eczema
• 2) Seborrheic Eczema
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• 3) Discoid Eczema
• 4) Pompholyx Eczema
• 5) Gravitational Eczema
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• 6) Asteatotic Eczema
• 7) Lichen Simplex Eczema
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Psoriasis
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Types of Psoriasis
• 1) Chronic Plaque
• 2) Guttate
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• 3) Flexural
• 4) Scalp Psoriasis
• 5) Palmar-plantar pustulosis
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• 6) Generalised Pustular Psoriasis
• 7) Erythroderma
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Nail Changes in Psoriasis
Pitting
Onycholysis
ridging
Nail loss
discolouration