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Dermatology - Toronto > Differential Diagnoses > Flashcards

Flashcards in Differential Diagnoses Deck (8)
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1
Q

Lesion : Brown Macule

  • Infectious
  • Inflammatory
  • Drug/Toxin
  • Miscellaneous
A

Lesion : Brown Macule
- Infectious: -
- Inflammatory: Post-inflammatory, hyper-pigmentation
- Drug/Toxin: UV radiation, actinic/solar lentigo, freckle (ephelide)
- Miscellaneous: Congenital: café-au-lait spots, congenital nevus, epidermal/ junctional nevus. Neoplasia: lentigo maligna, MM, pigmented BCC
Other: melasma/chloasma (“mask of pregnancy”)

2
Q

Lesion : Discrete Red Papule

  • Infectious
  • Inflammatory
  • Drug/Toxin
  • Miscellaneous
A

Lesion : Discrete Red Papule

  • Infectious: Folliculitis, Furuncle, Scabies
  • Inflammatory: Acne vulgaris, Lichen planus, Rosacea, Psoriasis, Urticaria
  • Drug/Toxin: Bites/stings
  • Miscellaneous: Vascular: hemangioma, pyogenic granuloma Other: dermatofibroma, milaria rubra
3
Q

Lesion : Red Scales

  • Infectious
  • Inflammatory
  • Drug/Toxin
  • Miscellaneous
A

Lesion : Red Scales

  • Infectious: Pityriasis rosea, Secondary syphilis, Tinea
  • Inflammatory: Dermatitis (atopic, contact, nummular, seborrheic), Discoid lupus, Lichen planus, Psoriasis
  • Drug/Toxin: Gold
  • Miscellaneous: Neoplastic: mycosis fungoides
4
Q

Lesion : Vesicle

  • Infectious
  • Inflammatory
  • Drug/Toxin
  • Miscellaneous
A

Lesion : Vesicle

  • Infectious: Cat scratch disease, Impetigo, Viral: HSV, HZV, VZV, Molluscum, Coxsackie, Scabies
  • Inflammatory: Acute contact dermatitis, Dyshidrotic eczema
  • Drug/Toxin: -
  • Miscellaneous:Other: dermatitis herpetiformis, porphyria cutanea tarda
5
Q

Lesion : Bulla

  • Infectious
  • Inflammatory
  • Drug/Toxin
  • Miscellaneous
A

Lesion : Bulla

  • Infectious: Bullous impetigo
  • Inflammatory: Acute dermatitis EM, SJS, TEN, SLE
  • Drug/Toxin:Fixed drug eruption
  • Miscellaneous: Autoimmune: bullous pemphigoid, pemphigus vulgaris Other: dermatitis herpetiformis, porphyria cutanea tarda
6
Q

Lesion : Pustule

  • Infectious
  • Inflammatory
  • Drug/Toxin
  • Miscellaneous
A

Lesion : Pustule

  • Infectious: Candida, Dermatophyte, Impetigo, Sepsis, Varicella
  • Inflammatory: Acne vulgaris, Rosacea, Dyshidrotic dermatitis, Pustular folliculitis, Pustular psoriasis
  • Drug/Toxin: Acute generalized exanthematous pustulosis (usually secondary to drug reaction)
  • Miscellaneous: Other: hidradenitis suppurativa
7
Q

Lesion : Oral Ulcer

  • Infectious
  • Inflammatory
  • Drug/Toxin
  • Miscellaneous
A

Lesion : Oral Ulcer
- Infectious: Aspergillosis, CMV, Coxsackie, Cryptococcosis, HSV/HZV, HIV, TB, Syphilis
- Inflammatory: Allergic stomatitis, EM/SJS/TEN, Lichen planus, Seronegative arthropathies, SLE, Recurrent aphthous stomatitis, Behçet’s disease
- Drug/Toxin: Chemotherapy Radiation therapy
- Miscellaneous: Autoimmune: pemphigus vulgaris Congenital: XXY
Hematologic: sickle cell disease Neoplasia: BCC, SCC

8
Q

Lesion : Skin Ulcer

  • Infectious
  • Inflammatory
  • Drug/Toxin
  • Miscellaneous
A

Lesion : Skin Ulcer
- Infectious: Plague, Syphilis, TB, Tularemia
- Inflammatory: RA, SLE, vasculitis, UC (pyoderma gangrenosum)
- Drug/Toxin
- Miscellaneous: Autoimmune: necrobiosis lipoidica diabeticorum (e.g. DM) Congenital: XXY
Hematologic: sickle cell disease
Neoplasia: SCC
Vascular: arterial, neurotropic, pressure, venous, aphthous, leukoplakia, traumatic