Sebaceous cyst

epithelial cystsebaceous cystswen
A sebaceous cyst is a term commonly used to refer to either:wikipedia
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Sebaceous gland

sebumsebaceous glandssebaceous
Both of the above types of cyst contain keratin, not sebum, and neither originates from sebaceous glands.
Several related medical conditions involve sebum—including acne, sebaceous cysts, hyperplasia, and sebaceous adenoma.

Cyst

cystscysticencyst
Both of the above types of cyst contain keratin, not sebum, and neither originates from sebaceous glands.
Sebaceous cyst – sac below skin

Epidermoid cyst

epidermoid cystsepidermal cystepidermoid
Epidermoid cysts (also termed epidermal cysts, infundibular cyst), or
Another similar and easily confused cyst is the sebaceous cyst.

Hair loss

alopeciabaldbaldness
They are more common in hairier areas, where in cases of long duration they could result in hair loss on the skin surface immediately above the cyst.
Temporary loss of hair can occur in areas where sebaceous cysts are present for considerable duration (normally one to several weeks).

Scrotum

scrotalscrotal skinscrota
In males a common place for them to develop is the scrotum and chest.
sebaceous cyst

Epidermis

epidermalrete ridgesepidermal cells
Epidermoid cysts originate in the epidermis and pilar cysts originate from hair follicles.

Hair follicle

hair folliclesfolliclefollicles
Epidermoid cysts originate in the epidermis and pilar cysts originate from hair follicles.

Steatocystoma simplex

steatocystoma
"True" sebaceous cysts, cysts which originate from sebaceous glands and which contain sebum, are relatively rare and are known as steatocystoma simplex or, if multiple, as steatocystoma multiplex.

Steatocystoma multiplex

"True" sebaceous cysts, cysts which originate from sebaceous glands and which contain sebum, are relatively rare and are known as steatocystoma simplex or, if multiple, as steatocystoma multiplex.

Trichilemmal cyst

pilar cystwen
Pilar cysts (also termed trichelemmal cysts, isthmus-catagen cysts).

Scalp

scalp hair
The scalp, ears, back, face, and upper arm, are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet.

Ear

earshuman earauricula
The scalp, ears, back, face, and upper arm, are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet.

Human back

backlower backback muscles
The scalp, ears, back, face, and upper arm, are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet.

Face

human facefacialfacial feature
The scalp, ears, back, face, and upper arm, are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet.

Arm

upper armarmsbroken arm
The scalp, ears, back, face, and upper arm, are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet.

Hand

handspalmpalms
The scalp, ears, back, face, and upper arm, are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet.

Sole (foot)

solesolessole of the foot
The scalp, ears, back, face, and upper arm, are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet.

Thorax

chestthoracicpectoral
In males a common place for them to develop is the scrotum and chest.

Connective tissue

fibrous tissuefibrous connective tissueconnective
Fibrous tissues and fluids,

Keratin

keratinouskeratinizationkeratinized
Both of the above types of cyst contain keratin, not sebum, and neither originates from sebaceous glands. A fatty (keratinous) substance that resembles cottage cheese, in which case the cyst may be called "keratin cyst". This material has a characteristic "cheesy" or foot odor smell,

Cottage cheese

cottagecottage (curd) cheesecurds and whey
A fatty (keratinous) substance that resembles cottage cheese, in which case the cyst may be called "keratin cyst". This material has a characteristic "cheesy" or foot odor smell,

Foot odor

foot odourfeetodor of sweaty feet
A fatty (keratinous) substance that resembles cottage cheese, in which case the cyst may be called "keratin cyst". This material has a characteristic "cheesy" or foot odor smell,

Pus

purulentsuppurationpyogenic
A somewhat viscous, serosanguineous fluid (containing purulent and bloody material).

Testosterone

low testosterone levels due to agingmetabolismprenatal exposure to androgens
High levels of testosterone and the use of androgenic anabolic steroids will cause such cysts.

Dermatobia hominis

human botflytorsaloHuman botfly maggots
A case has been reported of a sebaceous cyst being caused by the human botfly.