Chapter 16:
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16.1
Urticaria
To conclude this pictorial presentation of the most common skin diseases for the general practitioner, we thought it would be interesting to include the modern diagnostic procedure in dermatology applied to an everyday problem: urticaria.
Physical Urticaria? Provoked by direct contact with a substance? Genetic origin? Systemic origin? Medicamentouse or food allergy? Infectious origin?
No No No No No
Yes Yes Yes Yes Yes
If duration is longer than 6 weeks: Chronic idiopathic urticaria
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Algorithmic approach to a dermatological diagnosis
Urticaria
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Physical urticaria
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Vibratory angio-oedema
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Solar urticaria Cholinergic urticaria Cold urticaria Heat urticaria Delayed pressure urticaria
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No Physical urticaria
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Simple or retarded dermographism
Aquagenic urticaria
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alphabetical
Algorithmic approach to a dermatological diagnosis
Urticaria
page: 475
Physical urticaria
Simple or retarded dermographism
Rub with a blunt tip. other disease
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Algorithmic approach to a dermatological diagnosis
Urticaria
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Physical urticaria
Solar urticaria
Photosensitivity test. other disease
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Physical urticaria
Cholinergic urticaria
Small papules induced by heat, physical effort, stress. other disease
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Urticaria
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Physical urticaria
Cold urticaria
Test with ice cube sheathed in plastic. other disease
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Algorithmic approach to a dermatological diagnosis
Urticaria
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Physical urticaria
Heat urticaria
Test with test-tube of hot water.
Aquagenic urticaria
Immersion test: hand in water at ambient temperature.
Vibratory angio-oedema basic lesion
Professional circumstances ( particularly pneumatic hammer). other disease
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Physical urticaria
Delayed pressure urticaria
Test by pressure with a weight strapped on to the body. other disease
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Provoked by direct contact with a substance
Contact urticaria
Rapid result patch test, prick test or scratch test. other origin
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Genetic origin
Hereditary angioneurotic oedema
Investigate for deficiency of C1 esterase inhibitor. other origin
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Systemic origin
Lesions persisting at the same place for more than 24h, not very itchy, accompanied by joint pains and myalgias; histopathological appearance that of vasculitis. Investigate for:
1 2
other origin
3 4
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acute lupus erythematosus (1-3) Stills disease macroglobulinaemia blood disease hyperthhyroidism urticarial vasculitis (4)
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Medicamentous or food allergy
Painstaking history with regard to drugs and food
- Drugs Especially acetylsalicylic acid (see photos) - Food Especially preservatives and colourings Do provocation tests. other origin
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Infectious origin
- Hepatitis A (photo) Exceptional case of figured urticaria revealing hepatitis A in its initial phase. The yellowish colour of the central oedematous (urticated zone) is caused by accumulation of bilirubin in the oedema fluid. Hepatitis B or C Infectious mononucleosis Parasitosis Focus of bacterial infection Focus of mycotic infection other origin
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