*Develops secondarily to many types of disease (''e.g.'' [[Skin parasitic - Pathology|ectoparasites]], [[Mycotic skin inections - Pathology|fungal infections]], [[Endocrine effects on the skin - Pathology|endocrine disease]], internal disease or allergy)
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*Develops secondarily to many types of disease (''e.g.'' [[Skin parasitic - Pathology|ectoparasites]], [[Mycotic skin infections - Pathology|fungal infections]], [[Endocrine effects on the skin - Pathology|endocrine disease]], internal disease or allergy)