Dermatology

This patient wonders whether the insect he found on his headboard might be responsible for the clusters of pruritic, crusted papules on his legs. This turned out to be a bed bug.

The areas that contained linear erythema, punctuated by stippled pigmentation, and a small round area of stippled pigmentation were biopsied: both showed pigmented basal cell carcinoma.

This new-onset “growth” was removed and shown to be a solitary neurofibroma, which is not an indication of any of the genodermatoses marked by a multiplicity of such neoplasms.

Acne?; Halo Nevus; Solitary Fibrous Tumor; idiopathic chilblains

Biopsy of the 3 red “spots” in close proximity showed lichenoid keratosis-a benign lesion, probably related to seborrheic keratosis, which often mimics skin cancer.

Livedo reticularis; persistent fatigue and weight gain; groin rash; paraneoplastic syndrome; funny mole.

While it might be tempting to dismiss this as a picker's nodule, lesion's thickness suggested the need for a biopsy, which revealed that the lesion was an infiltrative, invasive basal cell carcinoma. The lesson? Never hesitate to biopsy when the slightest uncertainty exists as to the correct diagnosis.

The predominantly infraorbital erythema and swelling suggested that this rash was related to a material that was being placed in the eyes and dripping from them. Patch testing showed that the patient was allergic to the preservative in the eyedrops she had been using.

The translucent papule on the upper lip has a few small blood vessels that traverse its surface. These are morphologic features of basal cell carcinoma, a presumptive diagnosis that was confirmed by biopsy.

Does this look like melanoma? Which is not true of Löfgren syndrome? Yoga and Afib; what cause of mental confusion? Skin lesions and HIV.. . . See if you can answer this week's quiz questions.

The redness on this woman's nose represents fairly severe photodamage with extensive actinic keratosis. Use of a topical therapy to achieve clearance of a field of actinic damage can be done with imiquimod, 5-fluorouracil, or ingenol mebutate creams, or diclofenac gel.

Cutaneous horns can arise on top of: seborrheic keratosis (as in this patient’s case), actinic keratoses, warts, basal and squamous cell carcinomas. Therefore, the lesion-and especially the base-must be submitted for pathologic diagnosis.

“Stippled” pigment is highly typical of a pigmented basal cell carcinoma. Diagnostic contenders include atypical seborrheic keratosis and superficial spreading melanoma.

Edema of the hands has numerous etiologies: leukocytoclastic vasculitis, puffy hands from HCV infection, DVT, lymphedema, trauma

Löfgren syndrome is a form of acute sarcoidosis characterized by a triad of symptoms: hilar adenopathy, erythema nodosum, and arthralgias.

The morphology of a round, red to purple patch, with or without blistering, is typical of a fixed drug eruption. This entity usually manifests as a solitary spot, but can be multiple. Tetracycline antibiotics and barbiturate sedatives are common causes. This patient had been taking doxycycline.

This friable lesion with rapid and destructive growth is classic for granuloma inguinale. This patient was treated successfully with trimethoprim/sulfamethoxazole.

Ecchymosis is caused by the rupture of small blood vessels beneath the skin. Some causes are benign, others may herald dangerous disease.

Condylomata acuminata this extensive are beyond the capacity of all topical therapies. The area was initially treated by carbon dioxide laser ablation, and residual small foci of infection were subsequently treated with topical 5% imiquimod cream.

The combination of itching massive scaling suggests the diagnosis of crusted scabies. This variety of scabies is seen in those who are immunosuppressed or immunocompromised (typically HIV+). Repeated oral doses of ivermectin along with topical permethrin application were required to clear this infestation.

A 24-year-old woman sought medical attention because of the acute onset of a very painful vulvar rash. She had never experienced anything similar. Do you recognize these lesions?

The patient received standard acyclovir dosage for first outbreak genital herpes: 200 mg orally, 5 times daily, for 10 days total. At this point, there is no way to predict how often or how severe future recurrences will be.

A lot of sound-alike medications are on the market that can easily be prescribed incorrectly. Hydralazine and hydroxyzine are a good example, as this case attests.

This painless, indurated ulcer is typical of the chancre of primary syphilis. This patient also had a positive RPR in a titer of 1:32.

Any adult with patchy hair loss with preservation of follicular openings should be questioned about sexual exposures. This presentation is not typical of alopecia areata, and the patient is too old for tinea capitis to be a major consideration.

Chlamydia trachomatis, serovar L2b-a recently discovered microbe-was the cause of atypical lymphogranuloma venereum in this HIV-positive patient.

This multi-factorial eruption requires topical or systemic antifungal treatment in conjunction with broad-spectrum antibacterial therapy, topical desiccating maneuvers (such as Burrow’s soaks), and discontinuation of OTC interventions that might be worsening the problem.

Squamous cell carcinoma is the most common tumor of the penis. Melanoma, sarcoma, and (rarely) basal cell carcinoma and cutaneous metastasis also occur here.

The confluence of small, scaly, hyperpigmented patches on the chest (and often neck and upper back) is classic for tinea versicolor.

These firm, pigmented plaques, in a young African American, are most likely cutaneous sarcoidosis. This diagnosis was verified by biopsy.