Dermatology ID Flashcards

0
Q

2 yo kid comes to your peds clinic with his mom. He has raised bumps on his face that a week ago were just small flat red spots. What is your dx? What caused this? What happens when the bumps erode?

A

Kid has IMPETIGO which is a superficial bacterial skin infection due to S. Aureus or S. pyogenes. The rupture of the bumps (pustules) result in dry, crusted, honey-colored serum.

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1
Q

A 37 yo farmer presents to the derm office with a fever and a tender rash which was red and swollen. He mentions that he recently had surgery on his knee. What is causing this presentation? A week later he comes back with fever and when palpating his arm, you feel that it is bubbly. What is going on and what should you do next?

A

Farmer has CELLULITIS, mostly due to surgery, trauma or insect bite. His infection is a dermal and subq infection due to s aureus or s pyogenes. Can progress to necrotizing fasciitis with necrosis of subq tissues due to anerobic flesh eating bacteria which make CO2 and leading to crepitus. This is a surgical emergency.

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2
Q

Pt presents with erythematous rash and fever. He complains that his skin has been peeling off and is very concerned. What could be the culprit? Which layer is this happening on the skin? How would you distinguish this from TEN?

A

Pt has STAPHYLOCOCCAL SCALDED SKIN SYNDROME sue to S aureus infection. Exfoliating A and B toxins result in epidermal lysis of stratum granulosum. Distinguished from TEN because separation in TEN happens at the dermal epidermal junction.

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3
Q

A driver comes to you with bumps on his hands that have a rough appearance on close inspection. What does he have? What infection and where could cause this? What is another common location?

A

The driver has VERRUCA aka warts. Due to HPV infection of ketatinocytes and is characterized by koilocytic (nuclear) changes. Feet are the other common location.

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4
Q

A college sophomore comes worried to your student health center with a rash that has a pink color and is slightly depressed. Upon palpation, the mass is firm. Upon interviewing further, you learn that she is worried she caught something from her boyfriend. What is causing this? What shows up in histology? Who are the usual suspects?

A

MOLLUSCUM CONTAGIOSUM due to pox virus. It affects keratinocytes and they show cytoplasmic inclusions also known as molluscum bodies. Usual suspects are children, sexually active adults and immunocompromised individuals.

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