Derm Exam #2 Flashcards
Anagen
Normal active hair growth phase
Catagen
Degenerative phase when hair growth stops - brief transition in which it detaches from blood supply
Telogen
Resting phase of hair - no nourishment
Exogen
Hair fall out
4 hair growth phases
Anagen
Catagen
Telogen
Exogen
Life cycle of scalp hair length
2-8 years
Life cycle of leg hair length
5-7 months
Life cycle of arm hair length
1.5-3 months
Life cycle of eyelash length
4-6 weeks
Lanugo hair
Soft fine fetal hair
Vellus hair
Peach fuzz - colorless hair that covers the body
Intermediate hair
Characteristics of vellus and terminal hair - appears on scalp
Terminal hairs
Thick, pigmented hair on scalp, bear, etc.
Hair pull test
Scalp is gently pulled - greater than 5 pulled is pathologic
Trichogram
Anagen to telogen ratio
Normal 80-90% in anagen phase
MC alopecia
Androgenic
Male or female pattern baldness -terminal becomes vellus
Alopecia classification for men, for women
Men -Norwood Hamilton
Women -Ludwig-Savin
Female pattern baldness
Hairline out - MC after 50
Dx for androgenic alopecia
Telogen phase and atrophic follicles on bx
Increase in telogen hairs on trichogram
Hormone studies
Tx for androgenic alopecia
Minoxidil (Rogaine)
2-5% BID must be continued long term
Finasteride
Oral androgenic alopecia medication for men only
Female alopecia pharm
Spironolactone to block DHT
Alopecia areata
Usually a fam hx
Damage to follicle in anagen phase
Leads to rapid transformation to catagen and telogen
No scarring
Presentation of alopecia areata
Bald patches
No scaring or atrophy of skin
Black dots on surface “exclamation hairs”