Lesion : Brown Macule
- Infectious
- Inflammatory
- Drug/Toxin
- Miscellaneous
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”)
Lesion : Discrete Red Papule
- Infectious
- Inflammatory
- Drug/Toxin
- Miscellaneous
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
Lesion : Red Scales
- Infectious
- Inflammatory
- Drug/Toxin
- Miscellaneous
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
Lesion : Vesicle
- Infectious
- Inflammatory
- Drug/Toxin
- Miscellaneous
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
Lesion : Bulla
- Infectious
- Inflammatory
- Drug/Toxin
- Miscellaneous
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
Lesion : Pustule
- Infectious
- Inflammatory
- Drug/Toxin
- Miscellaneous
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
Lesion : Oral Ulcer
- Infectious
- Inflammatory
- Drug/Toxin
- Miscellaneous
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
Lesion : Skin Ulcer
- Infectious
- Inflammatory
- Drug/Toxin
- Miscellaneous
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
