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Department of Podiatry

POD11PDM - Podiatric Dermatology

Dermatitis & Eczema

 

 
 
 

Endogenous

• Predominantly eczema

 

 

o Atopic eczema (infancy)

 

- Inherited tendency

 

- Associated with other allergy (ie asthma)

 

- Presents early in childhood

 

- Face, truck and flexural areas commonly affected

 

- Intolerable itching

 

 

 


o Seborrhoeic eczema/dermatitis

 

- Associated with sebaceous glands

 

- Cradle cap (infants), dandruff (adults)

 

- Erythema and scaling

 

- Increased freq. in immunosuppressed patients

 

 

 


o Varicose eczema (stasis dermatitis)

 

- Middle age to elderly people affected

 

- Underlying oedema

 

- Haemosiderin deposition

 

- Pruritus

 

- Medial aspect of shin above medial malleolus

 

 

 

 


o Asteototic eczema

 


- Disorder of the elderly

 

- Legs are commonly affected

 

- Fine dry scaling and cracking

 

 


o Discoid eczema (nummular eczema)

 

- Affects young adults > children

 

- Nail ridging

 

- Symmetrical coin shaped lesions

 

- Pruritus

 

 


o Eczema of the palms and soles

 

- AKA ‘pompholyx eczema’

 

- Commonly affects adults

 

- Often associated with sweating

 

- Small vesicles

 

 


o Juvenile plantar dermatosis

 

- WB plantar forefoot

 

- Glazed and scaly erythema, sometimes fissuring

 

 

 

 

 


 

Exogenous

• Predominantly dermatitis

 


Contact dermatitis

 

- Histological changes (acute & chronic)

 

- Clinical changes (acute, sub-acute & chronic)

 

 


o Irritant contact dermatitis

 

- All people susceptible to irritant dermatitis

 

- May be strong or weak irritants

 

- Damage due to anhidrosis

 

- Erythema, oedema, papules, vesicles and bullae - possible necrosis and ulceration

 

 

 


o Allergic contact dermatitis

 

- Certain substances can evoke allergic response in predisposed individuals

 

- Palms/soles not as affected due to thicker skin

 

- Hypersensitivity reaction

 

- Patch testing to determine allergen

 

 

 

 

 


Photosensitive

 

o Photocontact allergic dermatitis

 

- Exogenous photosensitisers distributed in plants, cosmetics, antibacterials, industrial processes and drugs

 

- Much more unusual response

 

- Compound present in skin is modified by UV light

 

- Compound then becomes an allergen

 

 


o Phototoxic irritant dermatitis

 

- A substance sensitises cells to UV light

 

 

 

 


Links
ePodiatry's resources on dermatitis and eczema
 

Back to POD11PDM home page

 


Content Approved by: Head of Podiatry
Page maintained by: Podiatry Webmaster
Last Updated: February 16th, 2005