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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, oral spironolactone

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 (antimicrobials and NSAIDs are most common); delayed type IV hypersensitivity reaction
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, hands, feet
Prog: resolve days to weeks after drug is discontinued; PIH may persist
Tx: discontinue suspected medication, topical or systemic CS

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, missing or webbed fingers, hypoplastic teeth, low set ears, cleft lip or palate, bladder exstrophy, kidney abnormalities, CHD, vision and hearing impairment
Appearance: thin or absent skin areas, hypopigmentation, hyperpigmentation, and fat herniation; following Blaschko's lines; wart-like growth
Tx: vascular lasers for cutaneous papillomas and telangectatic areas 

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
Tx: symptom control, botox, aluminum antiperspirant, oral or topical glycopyrrolate 

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