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These 2 patients presented with a swollen hand and rapidly proximally progressive edema secondary to a bite.

These 2 patients presented with a swollen hand and rapidly proximally progressive edema secondary to a bite. What creature did the biting?

Swollen Hands-What’s Biting?

A 9-year-old boy presented with a 1-week history of pruritus and rash on his elbows, knees, back, and legs. Several areas of excoriation were noted. He had recently run through a field of tall grass but denied any other exposure history.

A 9-year-old boy presented with a 1-week history of pruritus and rash on his elbows, knees, back, and legs. He had recently run through a field of tall grass but denied any other exposure history. Your Dx?

Clinical Topics

What Cause of This Itchy Rash?

No labs, no biopsies . . .  you can make this Doorway Diagnosis just by looking.

Pictured is the posterior right knee of a 69-year-old woman showing a rounded protuberance at the popliteal fossa.

No labs, no biopsies, no imaging -- only your seasoned clinical judgement is required to make a diagnosis in this case. 

Bulge Behind the Knee 


This intensely itchy, blistering rash on the forearms and upper chest of a 13-year-old girl occurred after a day at the beach. The girl had polymorphic light eruption (PMLE), the most common abnormal reaction to UV light.

A. PMLE classically presents as a papular or papulovesicular eruption on the arms and anterior chest

B. The reaction usually begins 12 to 24 hours after an initial exposure to light of a suddenly increased intensity

C. Some parts of the body are severely involved while similarly exposed areas are paradoxically spared

D. The rash resolves after 7 to 10 days, often leaving whitish scarring

What are the characteristics of this blistering rash caused by exposure to UV light? 

Intensely Pruritic Rash After Sun Exposure in a Tween Girl 

A 67-year-old woman seen in clinic for unrelated concerns is incidentally noted to have a “rash” on her flank. She says it appeared in adulthood and has been stable for some years. On the right lower back, there is an asymptomatic reticulated erythema without scale or ulceration

. The patient admits to regular heating pad use on her lower back for pain. The remainder of the skin examination is within normal limits.

The patient says the incidental finding appeared in adulthood and has been stable for years. Can you identify this reticulated erythema?

An Asymptomatic Rash on the Low Back of an Older Woman 

This asymptomatic, hyperpigmented, hairy lesion is on the left upper back of a 16-year-old boy. The pigmentation was first noted 5 years earlier; the coarse and dark hair confined to the hyperpigmented area had appeared at age 13 years. History and physical examination findings were unremarkable.

This asymptomatic, hyperpigmented lesion was first noted 5 years earlier on the left upper back of a 16-year-old boy. A nevus? Cafe au lait spot? 

Hairy Brownish Patch

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