Differential Diagnosis in Dermatology

ZohrehTehranchi Dermatologist COMMON ACNE AND CYSTIC ACNE

Rosacea Rosacea

PERIORAL DERMATITIS ECZEMA/DERMATITIS Chronic irritant dermatitis

Dyshidrotic eczematous dermatitis Childood atopic dermatitis Autosensitization dermatitis (“id” reaction): dermatophytid Seborrheic dermatitis

PSORIASIS VULGARIS

Pemphigus vulgaris BULLOUS PEMPHIGOID (BP) Pityriasis rosea small-plaque parapsoriasis Large-plaque parapsoriasis (parapsoriasis en plaques) LICHEN PLANUS (LP) GRANULOMA ANNULARE (GA) Erythema multiforme ERYTHEMA NODOSUM Actinic keratoses

Bowen disease (Squamous cell carcinoma in situ)

Bowen disease and invasive SCC Squamous cell carcinoma: invasive on the lip Squamous cell carcinoma, well differentiated

Squamous cell carcinoma, undifferentiated Squamous cell carcinoma, advanced, well differentiated, on the hand Keratoacanthoma showing different stages of evolution BASAL CELL CARCINOMA (BCC) Basal cell carcinoma, ulcerated: Rodent ulcer A large rodent ulcer in the nuchal and Bas cell calarcinoma: sclerosing type retroauricular area extending to the temple Basal cell carcinoma, sclerosing, nodular,

Superficial basal cell carcinoma: solitary lesion and multiple lesions Superficial basal cell carcinoma, invasive Basal cell carcinoma, pigmented Dysplastic nevi Superficial spreading melanoma: arising within a dysplastic nevus Congenital nevomelanocytic nevus Melanoma: arising in small CNMN Melanoma in situ: lentigo maligna Melanoma in situ, superficial spreading type Superficial spreading melanoma, vertical growth phase Nodular melanoma Acral lentiginous melanoma Amelanotic melanoma Vitiligo

Vitiligo repigmentation Oculocutaneous albinism Melasma Hypermelanosis with acne Postinflammatory hypomelanosis Pityriasis alba Mammary Paget disease Neurotic excoriations Trichotillomania Factitious syndrome Erythrasma Intertrigo: group B streptococcus (GBS) IMPETIGO AND ECTHYMA Follicultis and Furunculosis Carbuncle Leprosy: tuberculoid type Leprosy: borderline-type CUTANEOUS TUBERCULOSIS

Tuberculosis verrucosa cutis Scrofuloderm Lupus vulgaris a: Tinea pedis: interdigital dry type Tinea pedis: interdigital macerated type Tinea pedis: Tinea manuum, Tinea facialis Tinea barbae and tinea facialis Tinea capitis: ”gray patch” type Tinea capitis: ”black dot” variant

Kerion Tinea capitis: favus Tinea barbae

Dermatophytic folliculitis Cutaneous candidiasis: intertrigo Cutaneous candidiasis: interdigital intertrigo

Candidiasis: diaper dermatitis PITYRIASIS VERSICOLOR (PV) Pityriasis versicolor: hypopigmented MOLLUSCUM CONTAGIOSUM Human orf: multiple lesions on hands

HUMAN PAPILLOMAVIRUS INFECTIONS

Hand-foot-and-mouth disease HERPES SIMPLEX VARICELLA ZOSTER VIRUS INFECTIONS Papular urticarial insect bite Pediculosis

Pediculosis pubis: crab louse in pubis Scabies LEISHMANIASIS HIV/AIDS syndrome

Eosinophilic folliculitis

Oral hairy leukoplakia Alopecia areata Scarring alopecia