The Laminous Subsumption-Epidermal Inclusion Cyst- Crimson Publishers
Preface
Epidermal inclusion cyst is a frequently discerned, benign, noncontagious,
cutaneous cyst incorporated with lamellar keratin. As the cyst wall is
engendered from an infundibular portion of hair follicle, the lesion may
preponderantly be designated as an infundibular cyst. Sebaceous glands do not
engender epidermal inclusion cyst and sebum does not configure as an
intra-cavitary component. Thus, the terminology of “sebaceous cyst” is unwarranted
and requires circumvention. Additionally designated as epidermoid cyst,
epidermal cyst, follicular cyst- infundibular type, inclusion cyst or keratin
cyst, the stable epidermal inclusion cyst may progress gradually. Normal
cutaneous bacterial flora as Staphylococcus aureus or Staphylococcus
epidermidis may infect an epidermal inclusion cyst. Disease Characteristics
Generally, epidermal inclusion cyst occurs due to damage to pilo-sebaceous unit
and is discerned within zones of inflamed or persistently irritated hair
follicles. Lesions may concur with acne vulgaris. Neonatal epidermal inclusion
cysts are designated as milia [1,2]. Epidermal inclusion cyst is frequently
discerned upon the face, scalp, neck, trunk, dorsal region, or scrotum. No site
of cyst emergence is exempt. Exceptionally, coalescing epidermal inclusion
cysts may be exemplified upon trunk or extremities (Figure 1).
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