| Etiology | 
                
                  - This condition is due to constitutional insufficiency
                    and deficiency of the Lungs and Spleen complicated by external
                    contraction of Wind, Dampness and Heat, which are obstructed
                    in the skin and flesh. An enduring condition will cause
                    damage to Yin and Body Fluids resulting in Yin Deficiency
                    and Blood-Dryness
 
                  -  The mothers preference for fatty, sweet, spicy, or fried
                    food or overindulgence in fish and seafood during pregnancy
                    or lactation will result in impairment of the Spleen's transportation
                    function and the generation of damp-heat in the interior.
                    The mother will pass on the Heat Toxins and turbid substances
                    in the Blood to the baby through breast-feeding. If this
                    is complicated by improper feeding and nursing after birth,
                    Damp-Heat may move to the skin and flesh to cause the disease.
                    Dampness tends to predominate in plump babies, heat in thin
                    and weak babies.
 
                  -  Constitutional weakness plus the child's preference for
                    an inappropriate diet of fish, seafood and spicy food will
                    damage the Spleen and Stomach and result in the generation
                    of damp-heat. Where this damp-heat moves outward to accumulate
                    in the skin and flesh and is complicated by invasion of pathogenic
                    wind, Dampness or Heat, or toxic substances such as dust
                    mites or pollen, red papules and vesicles may appear suddenly.
                    Where impairment of the Spleen's transformation function
                    results in Damp-Heat accumulating in the Interior, this Damp-Heat
                    may be retained over a long period, resulting in a chronic
                    disease with repeated occurrence.
 
                  -  Congenital insufficiency leads to Liver and Kidney Deficiency.
                    Lack of proper care after birth results in damage to the
                    Spleen and Lungs. Damage to the Spleen leads to Deficiency
                    of the source for generating transformation of Qi and Blood;
                    damage to the Lungs causes weakness of Wei Qi. As
                    a result, it is easy for External pathogenic factors to invade.
                    At the initial stage, these factors are obstructed in the
                    skin and interstices, causing dryness and itching; at the
                    later stage, Yin is damaged and Blood is consumed,
                    making the skin rough and leathery.
 
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                   Clinical Manifestations
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                    - Chronic itching 
 
                    - Superficial inflammation of the skin
 
                    - Redness
 
                    - Weepy, crusted lesions
 
                    - May all begin in first few months of life
 
                    - Worsened by stress, environmental changes and wool
 
                     
                    - Associated with genetic factors and is also known as
                      hereditary allergic dermatitis.
 
                      Family history of susceptibility to asthma, hay fever,
                      urticaria, and eczema 
                      -Allergy to heterologous protein 
                      -High serum immunoglobulin (IgE) levels 
                      -An increase in the number of eosinophil leukocytes in
                      the blood 
                    - Infantile Stage (1 month - 2 years):
 
                      Main sites involved:  
                      Cheeks 
                      Forehead 
                      Scalp 
                      It may spread to the trunk and limbs 
                      * Fat babies who tend to sweat are more likely to suffer
                      from an    exudative-type condition. 
                        -Lesions manifest as erythema and a dense
                      distribution of   pinpoint papules, papulovesicles
                      and vesicles with exudation.  
                        -Thick or thin yellow crusts form when the
                      exudate dries up.  
                        -A moist, bright red erosive base will often
                      show once crusts fall    off due to rubbing
                      or scratching provoked by itching. 
                      *Thin, weak babies are more likely to suffer from a dry-type    condition.  
                        Lesions are characterized by pale red or dark
                      red erythematous   patches 
                        A dense distribution of small papules without
                      vesicles 
                                               Dryness without obvious
                      exudation 
                        Grayish-white bran-like scales on the surface
                      of the lesions 
                                               Slight infiltration, lichenification,
                      fissuring scratch marks, or   bloody crusting
                      will be present in a persistent condition  
                    - Childhood Phase (3-12 years):
 
                      Main sites involved:  
                      Antecubital and popliteal fossae 
                      Neck 
                      Wrists and  
                      Ankles 
                      Lichenification, excoriations and dry skin are frequent 
                      Sleep may be affected 
                      In some, small, firm papules are found on back and extensor
                      aspects of the limbs; excoriation may lead to blood crusting
                      and pigmentation 
                    - Adolescent and Adult Phase (12 years - early 20's):
 
                      Main sites involved:  
                      Antecubital and popliteal fossae 
                      Anterior and lateral aspects of the neck 
                      Circumscribed dry lesions appear with infiltration, thickening
                      and lichenification, and pigmentation as a sequel 
                      Hands may also be involved after contact with irritants 
                     
                    - Atopic Dermatitis: A chronic, superficial inflammation of the skin, characterized by itching inside of the elbows and behind the knees
 
                      May have a history of allergies 
                      May begin in infancy
                      with red, weeping, crusted lesions on the cheeks and scalp then moves to the extremities 
                      Usually abates by age three but reappears frequently throughout one's life  
                      The itching is triggered by scratchy surfaces, humidity and environmental or psychological stress  
                      Repeated scratching leads to lichenification of the skin 
                      Secondary bacterial infections, dry skin and bleeding
                      may occur with possible changes in color  
                   
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