Pinna
![Solar Keratosis [Actinic Keratosis or Senile Keratosis]](https://medtube.net/images/min/2afd3b3c1defaa23d8a639fe6d724049/149/112/1 "Solar Keratosis [Actinic Keratosis or Senile Keratosis]")
Solar Keratosis [Actinic Keratosis or Senile...
Solar keratoses are premalignant lesions that arise on the sun exposed areas of the skin. Clinically, solar keratoses appear as dry, rough and adherent scaly lesions. Occasionally, solar keratoses produce...
Seborrheic Keratosis
Seborrheic keratoses are benign tumors appear after the third decade of life. Clinically, the appears as raised, greasy, "stuck on" lesions with visible keratotic plugs filling a central irregular...
Keratoacanthoma
A Keratoacanthoma is a benign, usually solitary, rapidly developing epithelial neoplasm that arises on the sun exposed areas of fair skinned, elderly individuals. These lesions are characterized by a...
![Angiolymphoid Hyperplasia with Eosinophilia [Kimura's Disease]](https://medtube.net/images/min/aa24e92aaef78a94fa92003013ec3244/149/112/1 "Angiolymphoid Hyperplasia with Eosinophilia [Kimura's Disease]")
Angiolymphoid Hyperplasia with Eosinophilia [Kimura's...
Kimura's disease or angiolymphoid hyperplasia with eosinophilia may present as raised angiomatous nodules arising on the pinna or superficial external auditory canal. These nodules usually persist, slowly...
Venous Lake
A venous Lake is a small, raised, soft blue lesion that may appear on the exposed surface of the pinna. These lesions may be caused by a localized venous capillary hemangioma or as in this case by a large...
![Infected Epidermal Inclusion Cyst [drained]](https://medtube.net/images/min/93a1fc620bea4c6f165c0d41cca253c5/149/112/1 "Infected Epidermal Inclusion Cyst [drained]")
Infected Epidermal Inclusion Cyst [drained]
An epidermal cyst may become infected. This is manifested by pain, tenderness and localized swelling. Incision and drainage of the cyst will release a foul-smelling purulent material containing necrotic...
![Epidermal Cyst [surgical specimen]](https://medtube.net/images/min/682d3e9584f601fc595604bcdf1a1f66/149/112/1 "Epidermal Cyst [surgical specimen]")
Epidermal Cyst [surgical specimen]
Histologically, epidermal cysts are lined with a true squamous epithelium similar to that seen on the surface of the skin. The cyst itself is filled with laminated layers of shed keratin.
Epidermal Cyst
Epidermal cysts are slow growing, round, firm intradermal or subcutaneous cysts that arise most commonly from the infundibula of hair follicles.
Milia
Milia are multiple superficially located small white cysts that arise from the lowest portion of the infundibulum of the sebaceous duct. These tiny cysts differ from epidermal cysts only in size.
Comedones
A comedone consist of a collection of keratin debris and sebum trapped at the opening of a pilosebaceous follicle. If the follicle is closed, this collection appears whitish and is referred to as a "whitehead"....