MW S Rationales Files/Rash Rationale.Pdf
Total Page:16
File Type:pdf, Size:1020Kb
A RATIONALE FOR RASHES A RATIONALE FOR RASHES Assoc. Prof. Warwick Carter MB.BS; FRACGP; FAMA A guide to the diagnosis of skin rashes, patches, itches and damage. 1 A RATIONALE FOR RASHES CONTENTS Introduction SECTION ONE Dermatological Diagnostic Flow Chart A flow chart that leads the user through various symptoms and signs to possible diagnoses. SECTION TWO Diagnostic Algorithm for Rashes Symptoms and signs involving the skin and the conditions that may be responsible SECTION THREE Dermatological Conditions The symptoms, signs, investigation and treatment of medical conditions that may cause an alteration in the skin. Appendices Syndromes that may cause Skin Lesions Sun Exposure Skin Abnormalities 2 A RATIONALE FOR RASHES INTRODUCTION This book is designed for both the medical student and the doctor who is not a specialist in dermatology. It will take the user through a logical rationale in order to diagnose, and then treat, virtually every rash or skin condition likely to be encountered outside a specialist practice. There are two ways to reach a diagnosis, using the flow chart in Section One, or the Diagnostic Algorithms in Section Two. In Section One, a flow chart will guide the user through the presenting symptoms and signs of most rashes to a selection of possible diagnoses. As an alternative, the algorithms in Section Two will indicate the diagnoses possible with a variety of dermatological presenting symptoms. Once a diagnosis has, or number of differential diagnoses have been made, a detailed explanation of the various dermatological diagnoses can be found in the largest part of the book, Section Three. This has been written in a style that should be easy to understand by even junior medical students, with technical terms explained in each monograph, but should still be useful to the non-specialist doctor. The symptoms, signs, investigations and treatment of a very wide range of conditions are explained, along with pictures of the more common conditions. I trust that you will find it useful. Warwick Carter Brisbane OTHER BOOKS IN THIS SERIES A Rationale for the Brain A Rationale for Eyes A Rationale for the Abdomen A Rationale for the Chest 3 A RATIONALE FOR RASHES Section ONE DERMATOLOGICAL DIAGNOSTIC FLOW CHART 4 A RATIONALE FOR RASHES 5 A RATIONALE FOR RASHES Section Two DIAGNOSTIC ALGORITHMS FOR RASHES 6 A RATIONALE FOR RASHES Acne DIAGNOSTIC Acne vulgaris (common form) Papular acne (inflamed papules) ALGORITHMS Comedonal acne (less inflammation) Cystic acne (inflamed nodules, scarring) Steroid acne (secondary to steroid therapy) FOR RASHES Acne medicamentosa (due to drugs or cosmetics) Acne mechanica (due to friction from straps, etc.) Rosacea (telangiectasia, central face papules) Symptoms and signs Chloracne (contact with oils and chemicals) Pseudofolliculitis barbae (ingrown hair) involving the skin Acne keloidalis (keloid scar from traumatised acne) and the conditions that Pituitary tumour may be responsible Syndromes Adrenogenital syn. (amenorrhoea, rough skin) Cushing syn. (ecchymoses, obese, hirsute) Polycystic ovarian syn. (late onset, persistent) Premenstrual tension syn. (mastalgia, headache) See also Pustules FORMAT Alopecia Presenting Symptom Loss of hair (Alternate Name) Baldness Explanation of terminology Male pattern baldness (genetic) System or other group of symptoms Virilisation Diagnoses that may present with this symptom Testosterone secreting tumour [alternate name of diagnosis] (other symptoms of Alopecia totalis each diagnosis, or a discussion of the diagnosis) Chemotherapy Other entries to consider Diffuse hair loss Idiopathic (thinning of hair, either sex) Clinical Sign Any severe illness Sign (Alternate Name) [Abbreviation] Rapid weight loss Exp: An explanation of the sign, with its Shock or stress (eg. bereavement, surgery) methodology described in sufficient detail to Telogen effluvium (after stress) enable the practitioner to perform the test. Hypothyroidism (fatigue, dry skin, cold intolerance) Int: The interpretation of the sign. Hyperthyroidism (sweating, heat intolerance) (+) The diseases, syndromes etc. that SLE (butterfly rash, arthritis, nephritis) should be considered if the test is positive Postpartum (++) The interpretation of an exaggerated or Hypopituitarism grossly positive test Postmenopause (–) Ditto for a negative test result Diabetes mellitus (polydipsia, polyuria) (AB) Ditto for an abnormal test result Renal failure Phys: The pathophysiology of the sign to enable Protein deficiency (eg. malnutrition, vegetarian) its significance to be better understood Addison's disease (groin and axilla only) Other entries to consider Hypervitaminosis A (anorexia, weight loss, rashes) Irradiation Iron or zinc deficiency Ectodermal dysplasia Dubowitz syn. (reduced growth, ptosis) Fröhlich syn. (thin skin, low libido, obese) 7 A RATIONALE FOR RASHES Hallermann-Streiff syn. (dwarf, cataracts) Bleeding in Skin Langer-Giedion syn. (bullous nose, exostoses) See Ecchymosis; Purpura and Petechiae Loose Anagen syn. Drugs (eg. cancer therapy, anticoagulants, vitamin A, lithium, beta-blockers, oral contraceptives) Patchy hair loss Blisters Alopecia areata See Acne; Bullous Rash; Pustules; Vescicles Any severe illness Fungal scalp infection Discoid lupus erythematosus Bouchard's Nodes Traction (hair style that pulls on one area of scalp) Bony prominences at the dorsal margins of proximal Trichotillomania (recurrent trauma) interphalangeal joints Syphilis (variable symptoms) Severe osteoarthritis See also Heberden's Nodes Anal Itch See Pruritus Ani Bruising, Excess Thrombocytopenia (bleeding time increased) Idiopathic purpura Annular Rash Hereditary disorders of coagulation Rash consisting of circular lesion(s) (eg.haemophilia, von Willebrand's, Christmas Tinea cruris, corporis or capitis (red, scaly edge, disease) pruritis) Bone marrow suppression Pityriasis rosea (herald patch, trunk, scaly centre) Ionising radiation (eg. X-rays, gamma rays) Cutaneous larva migrans (hookworm infestation, Systemic viral infections itchy, track) Leukaemia (abnormal white cell count) Pigmented purpuic dermatosis (venous Typhus (fever, malaise) insufficiency, pepper spots peripheral on lesion) Subacute bacterial endocarditis Granuloma annulare (faint, flesh colour, limbs) Insect and snake bites Cutaneous lupus (chronic relapsing, trunk, Following massive blood transfusions confluent) Renal failure Hepatic failure Polycythaemia (rubra) vera Scurvy (inflamed and bleeding gums) Areolar Pigmentation Cushing syn. (moon face, obese, amenorrhoea) Darkening of areola and nipple AIDS (splenomegaly, fever, cachexia) Present or past pregnancy Defibrination syn. (see Syndromes) Sex hormone therapy Painful bruising syn. (female, paraesthesiae) Familial, Drugs (eg. steroids, arsenic, quinine, aspirin, Racial warfarin, chlorothiazide) See also Ecchymoses Auspitz's Sign Exp: When white scale is removed from a plaque Bullous Rash of scale covered dermatitis on the shins, a Large fluid filled blisters bleeding area results Impetigo (crusts, vesicles, pruritic) Int: (+) Psoriasis Herpes zoster (severe pain, dermatome Phys: In psoriasis, the plaque has a microcapillary distribution) circulation that is disrupted by its removal Herpes simplex (pain) Cellulitis (red, hot, fever) Toxic epidermal necrolysis Bald Contact dermatitis (erythema, itch) See Alopecia Drug eruptions Insect and arachnid bites 1 A RATIONALE FOR RASHES Erythema multiforme (target lesions, erythema, Circular Rash extensor surfaces) See Annular Rash Pemphigus (normal skin surrounds, relapsing crops) Pemphigoid (large, tense, elderly) Dermatitis herpetiformis (vesicles, papules, erythema) Circumoral Pallor Pompholyx (soles and palms, tense blisters) Exp: Relatively white area around mouth Porphyria cutanea tarda Int: (+) Fever of any cause (eg. scarlet fever) Epidermolysis bullosa Phys: Dilatation of superficial blood vessels in Lichen planus looser skin further away from mouth causes Burns (heat or irradiation) darkening and reddening of that area (rather than blanching of circumoral tissue) Butterfly Rash Coilonychia Erythematous, scaly rash spreading across both See Koilonychia cheeks and meeting on the nasal bridge Systemic lupus erythematosus (SLE) Photodermatitis Discoid lupus Cullen's Sign Atopic dermatitis Exp: Spontaneous umbilical bruising Serum sickness Int: (+) Ruptured ectopic pregnancy, carcinoma of pancreas, haemorrhagic pancreatitis, other causes of haemoperitoneum Café-au-Lait Spots Phys: Tracking of free intraperitoneal blood to Light brown spots on skin umbilicus Von Recklinghausen's disease of multiple neurofibromata Pityriasis versicolor Tuberous sclerosis Darierʼs Sign See also Pigmentation of Skin, Excess Exp: Rubbing a finger or blunt object firmly over a skin lesion causes oedema and erythema around the lesion Int: (+) Mastocytosis Chip Sign Phys: Pressure releases histamine from increased Exp: Skin blotches covered with fine, number of mast cells in lesion nonadherent scabs that are easily removed by a fingernail or blunt edge Int: (+) Pityriasis versicolor Phys: Superficial fungal infection Dark Skin See Chloasma; Face Pigmented; Pigmentation of Mouth; Pigmentation of Skin, Excess Chloasma Yellow-brown spotty skin pigmentation on upper cheeks and forehead Pregnancy Depigmented Skin Oral contraceptives Racial and familial Sun exposure Pityriasis versicolor (reddish, scaling) Syphilis Pityriasis alba (eczematous, asymptomatic) mMlaria, Vitiligo (dead white, well demarcated patches) Tuberculosis (TB) Halo naevus Cirrhosis Postinflammatory