Alopecia Areata Slide #32, "0232-Alopecia areata" from Set #2 Disease: Alopecia areata Age: Adult (18-60) Notes: This 31-year-old man presented with subtotal alopecia of the head. No signs of inflammation are evident of the skin. Hair growth is evident in discrete areas. Eyebrows are also alopecic.

Allergic Contact Dermatitis Slide #21, "0221-Allergic contact dermatitis-shoe" from Set #2 Disease: Allergic contact dermatitis-shoe Age: Unknown Notes: Allergic contact dermatitis of the foot. Patch testing examination showed an allergy to B-butyl-phenolformaldehyde resin, which was present in the shoes of this subject.

Tinea Corporis Slide #35, "0235-Tinea corporis" from Set #2 Disease: Tinea corporis Notes: Circular sharply marginated inflammatory lesions with raised edge on the buttocks with scaling. Some of these lesions are the result of single lesions which became confluent. Tricophyton rubrum was shown to be the etiologic agent.

Tinea Pedis Slide #36, "0236-Tinea pedis" from Set #2 Disease: Tinea pedis Notes: Same patient as above. The lateral and inferior surface of the left foot shows inflamed pin areas covered with white scales. The patient complained of itching of the foot and a foul odor.

Allergic Contact Dermatitis Slide #25, "0225-Allergic contact dermatitis" from Set #2 Disease: Allergic contact dermatitis Age: Adult (18-60) Notes: Allergic contact dermatitis to quaternium 15 which was present in the antimicrobial ointment used by this 39-year-old lady, showing erythema and vesiculation.

Tinea Corporis Slide #39, "0239-Tinea corporis" from Set #2 Disease: Tinea corporis Age: Adolescent/Young Adult (11-18) Notes: This 17-year-old girl presented with confluent multiple plaques of the neck, resulting in a circular sharply marginated lesion with raised edge. Central skin shows erythematous papules and scales.

Acanthosis Nigricans Slide #48, "2548-Acanthosis Nigricans" from Set #25 Class: Inflammatory and Metabolic Disorders Disease: Nutritional/Endocrine/Metabolic Disorders Disease 2: Cutaneous Manifestations of Systemic Disease Age: Adolescent/Young Adult (11-18) Race: Black Image Type: Clinical Photograph Notes: A 15-year-old black girl with amenorrhea and polycystic ovaries developed widespread acanthosis nigricans involving the neck intertriginous areas and skin over bony prominences (knuckles elbows knees). (See 2549 same patient.)

Keloids Slide #34, "0234-Keloids" from Set #2 Disease: Keloids Age: Adult (18-60) Notes: This 23-year-old girl with irregular protuberant lesions with claw-like extensions on the chest, which followed a burn 9 years ago. On the right arm, similar lesions due to penetrating injury of the skin.

Toxic Epidermal Necrolysis Slide #41, "0941-Toxic epidermal necrolysis (TEN), phenobarbital" from Set #9 Disease: Toxic epidermal necrolysis (TEN), phenobarbital Age: Child Notes: This 6-year-old boy developed a widespread blistering rash 4 weeks after commencing Phenobarbital for epilepsy. Mucous membrane involvement is seen and this is typical in TEN.

Carbuncle Slide #44, "0244-Carbuncle" from Set #2 Disease: Carbuncle Age: Adult (18-60) Notes: The solitary dome-shaped tender lesion on the back of this 44-year-old woman, surmounted by a crateriform nodule with purulent areas, was accompanied by fever and malaise. The patient was affected by type-II diabetes over the past 3 years.

Verruca Vulgaris Slide #45, "0245-Verruca vulgaris" from Set #2 Disease: Verruca vulgaris Age: Child Notes: On the dorsum of the right hand of this 9-year-old child are multiple raised keratotic papules of different size. Other small papules present a diameter of a few mm and are pink in color. The largest papules are more than 1 cm in diameter and present a grayish tonality.

Verruca Plana Slide #46, "0246-Verrucae planae" from Set #2 Disease: Verrucae planae Age: Adult (18-60) Notes: Multiple flat papules of yellow-reddish tonality are visible on the face of this 27-year-old lady.

Tinea Faciale Slide #38, "0238-Tinea faciale" from Set #2 Disease: Tinea faciale Age: Adolescent/Young Adult (11-18) Notes: Facial skin in this 13-year-old girl shows multiple ringworms presenting as annular erythematous lesions with scaling and central resolution. This infection was due to Trichophyton mentagrophytes.

Traumatic Tattoo Slide #48, "1848-Traumatic Tattoo" from Set #18 Class: Inflammatory and Metabolic Disorders Disease: Dermal Inflammatory Disorders/Deposition Diseases/Atrophies Age: Unknown Race: Caucasian Image Type: Clinical Photograph

Lichen Planus Slide #8, "2108-Lichen Planus" from Set #21 Class: Inflammatory and Metabolic Disorders Disease: Papulosquamous Disorders Age: Adult (18-60) Race: Caucasian Image Type: Clinical Photograph

Knuckle Pads Slide #13, "2113-Knuckle Pads Callus" from Set #21 Class: Cutaneous Neoplasms Disease: Benign Epithelial Proliferations Disease 2: Benign Bony and Soft Tissue Proliferations Age: Adult (18-60) Race: Caucasian Image Type: Clinical Photograph

Stasis Dermatitis Slide #17, "2117-Stasis Dermatitis" from Set #21 Class: Inflammatory and Metabolic Disorders Class 2: Miscellaneous Disorders and Other Topics Disease: Dermatitis/Eczema Disease 2: Vascular Disorders Age: Adult (18-60) Race: Caucasian Image Type: Clinical Photograph

Impetigo Slide #41, "0241-Impetigo contagiosa" from Set #2 Disease: Impetigo contagiosa Age: Adolescent/Young Adult (11-18) Notes: This face of this 17-year-old girl shows erythematous circular papules and vesicles and erosions surrounded by crusts in the central part. Crusts give the characteristic yellowish color similar to honey. The patient reported that the disease was accompanied by moderate itch.

Pyogenic Granuloma Slide #46, "2146-Pyogenic Granuloma" from Set #21 Class: Cutaneous Neoplasms Disease: Benign Vascular Proliferations/Ectasias Age: Unknown Race: Caucasian Image Type: Clinical Photograph

Acne Slide #28, "0228-Acne" from Set #2 Disease: Acne Age: Unknown Notes: Few non-inflamed lesions (micro- and macro- comedones), inflamed lesions (papules and pustules), deep inflammatory lesions (nodules, deep pustules) and scars present on the face.