Skin & Subcutaneous Tissue

Normal Processes

Abnormal Processes

Infectious, immunologic, and inflammatory disorders

Infectious disorders and infestations

Bacterial

impetigo, pilonidal cyst, scarlet fever (group A streptococcus)

Viral

molluscum contagiosum, herpes zoster, chickenpox, erythema infectiosum (fifth disease), rubella, measles

Fungal (deep and superficial)

tinea corporis, tinea versicolor

Infestations, nonvenomous bites, stings

Scabies

Immunologic and inflammatory disorders

Papulosquamous and eczematous dermatoses

Psoriasis, lichen planus, contact dermatitis 

Vesiculobullous disorders

pemphigus vulgaris, bullous pemphigoid,

Urticaria, erythema, exanthema, and purpura

Atopic dermatitis, Stevens-Johnson syndrome,

Neoplasms

Benign neoplasms, cysts and other skin lesions

hemangiomas, xanthomas

Malignant neoplasms

Basal cell carcinoma, melanoma, Kaposi sarcoma

Adnexal disorders (hair and hair follicles, nails, sweat glands, sebaceous glands, oral mucous membranes)

Disorders of the hair and hair follicles

seborrheic dermatitis, tinea capitis

Disorders of the sweat and sebaceous glands

acne vulgaris, rosacea