Dermatology

The left middle finger of this 30-year-old man was lacerated in a motorcycle accident. After it was surgically repaired, the finger developed some dystrophy as well as a small, separate fingernail in the lateral sulcus of the proximal nail fold.

For several months, a 55-year-old white construction worker experienced intense burning of the skin when exposed to direct sunlight. In addition, multiple fragile blisters appeared on the dorsa of his hands and arms; these rapidly developed into crusted, superficial erosions.

In Dr David Kaplan's Dermclinic case of a keratoacanthoma in a 63-year-old woman (CONSULTANT, April 15, 2007, page 473), the lesion is referred to as a "low-grade squamous cell carcinoma." However, keratoacanthomas, while previously considered to be a variant of squamous cell carcinoma, are actually benign.

A 39-year-old woman complained of excruciating pain that radiated from a chronic lesion on the left upper lip to the entire left side of the face. She had AIDS but was not receiving antiretroviral therapy.

Dermclinic: A Photo Quiz to Hone Dermatologic Skills

Tuberculin-type hypersensitivity is characterized by marked spongiotic dermatitis with intraepidermal and subepidermal vesiculation and scattered eosinophils.

Your Observations About the Man With the Tripod Sign

This 33-year-old Guatemalan man presented to a medical mission camp with generalized bilateral knee pain and inability to extend his leg without pain. The 4-ft 11-in patient had mild scoliosis, increased elbow carrying angles, and hypoplastic patellae. He had had dysplasia of the nails with triangular lunulae since birth. The fingernails were absent on the first and second digits of both hands. His mother had had similar physical findings. He had not had regular medical care.

A 60-year-old African American woman presented with an asymptomatic, nonpruritic lesion on the left temporal scalp that bled intermittently. She had noticed the lesion after she used a hair relaxant 5 to 6 months earlier. Since then, the lesion had slowly enlarged. She had a history of type 2 diabetes mellitus and hypertension. She denied alcohol consumption and tobacco use.

The sudden appearance of a pruritic confluent erythematous rash on the anterior neck and upper back prompted a 30-year-old woman to seek medical attention. She had recently started applying 5% tea tree oil to the area to treat chronic, recurrent tinea versicolor. An herbal specialist had recommended this therapy.

An 82-year-old man is seen for annual physical examination in the nursing home. He has resided there for 1 year because of the aggregate impact of multiple medical problems including, most prominently, laryngeal swallowing dysfunction associated with vocal cord paralysis.

Tinea corporis appears as an annular plaque with a rim of scaly erythema.

Tinea that occurs on the hands is referred to as tinea manuum.

Maceration or scale between isolated web spaces of the fingers suggests erosio interdigitalis blastomycetica (interdigital candidiasis). It most often occurs in the web space between the middle and ring fingers; sometimes the toes are affected. Erosio can spread and can be painful.

A fungal folliculitis (Majocchi granulomas) can occur if a superficial fungal infection is treated with topical corticosteroids. Fungal folliculitis is best treated with a short course of oral itraconazole or fluconazole.

Candidal infection can also occur at the lateral angles of the mouth; it causes erosions and breakdown of the skin. Angular cheilitis, or perleche, resembles the relationship between intertriginous candidiasis and intertrigo in that it is part infection and part inflammatory response to the impairment of epidermal integrity.

Tinea that occurs on the hands is referred to as tinea manuum. For unknown reasons, tinea often affects two feet and one hand. Tinea manuum must be distinguished from allergic contact dermatitis of the hands, which it resembles; this can be done by examination of a potassium hydroxide preparation. Tinea manuum can be treated with a topical antifungal agent.

This infection is usually caused by Candida albicans, whichis often present in body folds. Candidiasis is common in persons with diabetes and in obese persons. Other predisposing factors are the use of antibiotics, topical corticosteroids, or immunosuppressive drugs; poor nutrition; and immunosuppression.

Tinea pedis, or athlete's foot, is common in elderly persons. It manifests as maceration in the interdigital web folds and as scaly plaques on the plantar surfaces of the feet. A potassium hydroxide evaluation can establish the diagnosis. Tinea pedis is commonly associated with xerosis. It is best treated with a topical antifungal agent; treatment can be aided by a keratolytic such as lactic acid 12% cream.

Oral candidiasis, or thrush, is not uncommon in elderly persons. It can be related to poor dentition or immunosuppression, particularly as a result of oral corticosteroid use.

Tinea corporis occurs most often on the torso of elderly persons. It commonly appears as an annular plaque with a rim of scaly erythema. Occasionally, tinea corporis manifests with polycyclic annuli or with nummular plaques, which mimic nummular dermatitis. The examination of a potassium hydroxide preparation can establish the diagnosis. Tinea corporis can be treated effectively with a topical antifungal agent.

The prevalence of onychomycosis increases with age; it is less than 1% in persons younger than 19 years and rises to about 18% in those who are 60 to 79 years. The infection is more common in men than in women. Among the predisposing factors are diabetes mellitus, psoriasis, a family history of onychomycosis, use of immunosuppressive drugs, and peripheral vascular disease.

What is the most likely cause of these painful plantar ulcers? Can youidentify this well-demarcated rash that arose at the site of vein grafting?

While scuba diving in the Philippines, a healthy 36-year-old man noticed a red rash on his wrists and dorsa of both hands after he surfaced from a dive. Within a couple of hours, the rash had become painful, swollen, itchy, and papular.

A 77-year-old African American man with type 2 diabetes mellitus and coronary artery disease presented to the emergency department with acute scrotal swelling and pain. His testicles were erythematous with focal areas of necrosis and associated tissue destruction. Similar skin changes were apparent in the lower abdominal and inguinal regions.