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F

Female Pattern Hair Loss

Etiology: hereditary

Appearance: widening of hair part; thinning, no shining of scalp

Location: mid-frontal scalp

Tx: topical minoxidil

Fibrous Hamartoma of Infancy

Etiology: benign tumor of the subcutis and lower dermis
Histo: "ramen" waves
- grey/blue ball cells = immature mesenchyme
- mature fat that is honeycomb like
At risk: < 2 yo
Tx: excision
 

Fixed Drug Eruption

Etiology: drugs 

Appearance:

- Early lesions: sharply demarcated erythematous macules

- Late lesions: round or oval plaques that may evolve to become bullae and then erosions (occur 30 - 8 hours after ingesting drug)

Location: mouth, genitalia, face, acral

Prog: resolve days to weeks after drug is discontinued; PIH may persist

Folliculitis Decalvans

Etiology: considered to be the result of an abnormal immune response to S. aureus, although this is not yet proven

Appearance: erythematous, swollen, and scaly patches and plaque with crust and pustules (like CCCA, but smaller and with pustules)

Sx: itching, pain, and burning sensation

Tx: clindamycin, CCS (topical + oral or injected)

Focal Dermal Hypoplasia / Goltz Syndrome

Etiology: rare genetic disorder affecting tissues derived from ectoderm and mesoderm

Inheritance: XLD

Location: mouth, genitals, anus

Ass. conditions: coloboma, mission or webbed fingers

Appearance: thin or absent skin areas, hypopigmentation, hyperpigmentation, and fat herniation; following Blaschko's lines; wart-like growth

Frey's Syndrome

Etiology: postoperative complication involving parasympathetic fibers regenerating on sympathetic fibers of sweat glands (auriculotemporal branch of V3 is cut during an excision of the parotid gland and reinnervates the skin sweat glands in front of the ear)

Appearance: redness + sweating

Location: preauricular

Triggers: post-eating, thinking or dreaming about food

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