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===Primary idiopathic seborrhea===
===Primary idiopathic seborrhea===
*Abnormal cornification
*Epidermal turnover reduced to about 2/3 of normal
*Microscopically:
**Hyperkeratosis distending follicular ostia causing papillary appearance
**Parakeratosis at edges of follicular ostia
**Congested, oedematous dermal papillae
**Spongiotic epidermis with leukocytes
===Secondary seborrhea===
===Secondary seborrhea===
===Sebaceous adenitis===
===Sebaceous adenitis===