Principles of Dermatological Diagnosis - Dermatology

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Phases of Hair Growth Anagen is the growth phase, typically 3-6yrs, 3 6yrs, 85-90% 85 90% of hairs are in anagen at any one time Catagen is a 3wk transitional stage between anagen and telogen. telogen Typically no hairs on biopsy will be in catagen. catagen. Catagen hairs are seen in pathologic processes such as trichotillomania. trichotillomania Telogen is the shedding phase where the hair falls out, typically telogen is approximately 3 months. At any time 10-15% 10 15% of hair is in telogen This is why it is normal to lose 100 or so hairs each day Typical human has ~100,000 hairs. If you lose 100 per day, you would go through an entire hair cycle in 1000 days or approximately 3 years years The “pull pull test” test is used to diagnose abnormal hair loss. Hairs are gently tugged and no more than 10-15% 10 15% should come out as no more than this should be in telogen. telogen. (ex. If 20 are pulled, 2 should come out) Alopecia areata, areata, a condition causing patchy hair loss, has an abnormal “pull pull test” test at active sites as a large percentage of hairs are in telogen 16
Sebaceous Glands Sebaceous glands are a component of the hair follicle and after puberty secrete oil (sebum) which is driven by ANDROGENS Sebum is one of the components in the pathogenesis of acne vulgaris Function: Unknown except to make your skin shiny, give you zits, and make your hair stick together if you don’t don t shampoo 17
Page 1 and 2: Structure and Function of Skin, Exa
Page 3 and 4: Structure and Function of Skin 3
Page 5 and 6: Basic Science The skin is composed
Page 7 and 8: Epidermis The epidermis is composed
Page 9 and 10: Epidermis The type of epidermis pro
Page 11 and 12: Melanocytes All tanning is a reacti
Page 13 and 14: Langerhans’ Langerhans cell Lange
Page 15: Hair Follicles A hair follicle is a
Page 19 and 20: Sweat Glands There are two types of
Page 21 and 22: Blood Vessels of the Dermis The blo
Page 23 and 24: Mast Cells Arranged along dermal bl
Page 25 and 26: Components of Dermatological Evalua
Page 27 and 28: Physical Examination Be complete, e
Page 29 and 30: Types of Skin Lesions Primary Lesio
Page 31 and 32: More Primary Skin Lesions Papule: P
Page 33 and 34: Secondary Lesions Crust: Crust: Dri
Page 35 and 36: Shapes and Configurations Annular:
Page 37 and 38: How would you describe this lesion?
Page 57 and 58: Dematologic Therapy 57
Page 59 and 60: Drug Costs Topical Medications can
Page 61 and 62: Vehicles Solutions (liquids that ar
Page 63 and 64: Amount of Medication to Prescribe
Page 65 and 66: Amount of Medication to Prescribe A
Page 67 and 68:
Topical Corticosteroids Super-High
Page 69 and 70:
Side Effects of Topical Steroid Tre
Page 71 and 72:
Topical Antifungals The following a
Page 73:
END OF MODULE 73
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Principles of Dermatological Diagnosis - Dermatology

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