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Derm Dx

Yoo Jung Kim, AB, Philip R. Cohen, MD, Amor Khachemoune, MD, FAAD, FACMS, Section Editor
A 61-year-old man presented with an intermittent soft mass on his left forearm. Cutaneous examination revealed a soft, blue, 10 mm x 10 mm, compressible, painless, subcutaneous nodule on the proximal extensor aspect of his left forearm.
Shi Tang, BA, Philip R. Cohen, MD
A 23-year-old healthy man presented with yellow thickening on the palmar surface of his third, fourth, and fifth digits of both hands located at the metacarpophalangeal joints. 
Hannah J. Anderson, MD, Barbara B. Wilson, MD, Richard H. Flowers, MD, Amor Khachemoune, MD, FAAD, FACMS, Section Editor
In case two, a 62-year-old man was prescribed ingenol mebutate 0.015% for actinic keratoses on the temples, cheeks, nose, and helices. On day three of treatment, he presented with brightly erythematous patches on the malar cheeks and nose with numerous overlying minute superficial pustules.
Nili N. Alai, MD, FAAD, CPC-D, Section Editor: Amor Khachemoune, MD, FAAD, FACMS
A 29-year-old otherwise healthy Asian woman presented with refractory and debilitating bouts of itching limited to the right lateral knee, right lower leg, and right dorsal foot for more than 5 years’ duration.
Kim Nichols, MD, FAAD, Juliana Barresi, FNP-BC, Amor Khachemoune, MD, FAAD, FACMS
A 51-year-old white woman presented with multiple long-standing, asymptomatic, small, bluish subcutaneous papules on the bilateral cheeks and forehead. The patient reported that the bumps were painless and their appearance had become more visible over the past several months. She did not recount any precursor lesions in the involved areas. The patient reported that she had only had mild acne in the past and denied any other pertinent medical history or medications.
Rodaina Ahmed, MD, Lauren Fravor, OMS-IV, Amor Khachemoune, MD, FAAD, FACMS
A 72-year-old white man, previously employed as a truck driver, presented to the outpatient clinic for removal of nonmelanoma skin cancer from the tip of his nose. The patient had a past medical history significant for basal cell carcinoma removed from his right upper chest.
Pavan Paka, MD; Viktoryia Kazlouskaya, MD, PhD; Usha Alapati, MD; and Yi Chun Lai, MD, MPH , Amor Khachemoune, MD, FAAD, FACMS
A 66-year-old African American man with a history of multiple comorbidities was referred for evaluation of an umbilical mass that was present for several months. He noticed the lesion at approximately the same time that he started experiencing abdominal pain. He reported serous drainage when picking at the lesion and experienced tenderness on palpation
Allyson B. Brahs, BS, and Lynda A. Smith, MSPA; Section Editor: Amor Khachemoune
A 28-year-old man presented for evaluation of a new-onset rash on his back.
Ayesha U. Khan, MBA; and Amor Khachemoune, MD, FAAD, FACMS—Section Editor
A 27-year-old woman presented for a skin cancer screening. On exam, there was a 1-cm scaling plaque on the left mandible.
Marjon Vatanchi, MD; Usha Alapati, MD; and Amor Khachemoune, MD, FAAD, FACMS-Section Editor
A 37-year-old African-American man developed a pruritic skin eruption, which was present for 18 months.
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