Absence of hair from areas where it normally grows.
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Alopecia Areata
An autoimmune disease in which hair falls out in patches without scarring or inflammation.
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Ecchymosis
Bluish purple mark; bruises on the skin.
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Petechiae
Small pinpoint hemorrhage.
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Pruritus
Itching.
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Acne
Chronic papular and pustular eruption of skin with increased production of sebum.
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Acne Vulgaris
Caused by the buildup of sebum and keratin in the pores of the skin.
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Blackhead
Also called open comedo, is a partially blocked sebum plug.
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Whitehead
Closed comedo; forms if a pore is completely blocked.
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Burns
First degree: superficial/ epidermis and redden; Second degree: partial thickness burn with blisters, the burn goes into the dermis; Third degree: thickness burn with epidermis and dermis burned through with the subcutaneous layer affected with charred skin.
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Cellulitis
Diffuse, acute infection of the skin marked by local heat, redness, pain, and swelling.
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Exanthematous Viral Disease
Exanthem is an eruption of the skin or rash due to a viral infection.
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Gangrene
Death of tissue associated with loss of blood supply.
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Eczema
Inflammatory skin disease with erythematous, papulovesicular or papulosquamous lesions.
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Impetigo
Contagious pyoderma caused by inflammatory skin disease, usually caused by staphylococci.
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Psoriasis
Chronic recurrent dermatosis marked by itchy, scaly, red plaques covered by silvery gray scales.
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Scabies
Highly contagious, parasite infection of the skin with intense pruritus.
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Scleroderma
Chronic progressive disease of the skin and internal organs with hardening and shrinking of connective tissue.
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Systemic lupus erythematosus (SLE)
Chronic autoimmune inflammatory disease of collagen in the skin, joints, and internal organs.
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Tinea
Infection of the skin caused by a fungus.
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Tinea unguium
Fungus affecting the nail bed.
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Onycholysis
The fungus that causes the nail bed plate to turn yellow or white and move away from the nail bed.
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Tinea corporis
Ringworm fungal infection which presents itself as a ring pattern.
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Tinea barbae
Affecting the skin under the beard.
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Urticaria
Hives; acute allergic reaction in which red, round wheals develop on the skin.
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Angioedema
Swelling around the face and lips due to usually an allergic reaction.
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Vitiligo
A form of leukoderma where the loss of pigment in the skin.
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Callus
Increase growth of cells in the keratin layer of the epidermis caused by pressure or friction.
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Keloid
Excessive hypertrophied, thickened scar developing after trauma or surgical incision.
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Keratosis
Thickened rough lesion of the epidermis, associated with aging or skin damage.
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Actinic keratosis
Precancerous.
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Seborrheic keratosis
Benign lesion.
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Leukoplakia
White, thickened patches on mucous membrane tissue of the tongue or cheek that can turn cancerous.
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Pleural Nevi
Pigmented lesion of the skin, also known as moles.
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Dysplastic nevi
Moles with atypical cells that could become cancerous.
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Verruca
Epidermal growth (wart) caused by a virus.
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Common wart
A type of verruca.
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Plantar warts
Occurs on the soles of the feet.
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Venereal warts
On the genitals.
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Cancerous Lesion
Basal cell carcinoma; malignant tumor of the basal cell layer of the epidermis, usually on the nose caused by sun exposure.
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Kaposi sarcoma
Malignant vascular, neoplastic growth characterized by cutaneous nodules.
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Functions of the Skin
Protects against excessive loss of water, salt, heat, and pathogens. Sebum lubricates the surface, while sweat cools the body. Helps maintain body temperature through blood vessel constriction or dilation.
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Epidermis
The outermost cellular membrane layer containing keratin.
Contains fat cells that protect deeper tissue of the body.
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Nail structure
Lunula: half-moon shaped area at the base of the nail; Cuticle: narrow band of epidermis at the nail border; Paronychium: soft tissue surrounding the nail border.
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Sebaceous glands
Covers the entire body except for palms, soles, and lips.