Management of Papular Skin Lesions in the Underarm

Initial Diagnostic Approach

For a papular skin lesion in the underarm, the American College of Dermatology recommends performing an excisional biopsy with a 2mm margin of normal skin to establish a definitive diagnosis, as management depends entirely on the underlying etiology, with a strength of evidence level of high 1, 2
The Infectious Diseases Society of America suggests that determining whether the patient is immunocompromised is the first priority, as this fundamentally changes the differential diagnosis and urgency of management, with a strength of evidence level of high 1, 2
The Centers for Disease Control and Prevention recommend documenting fever, systemic symptoms, rapidity of lesion development, and presence of pain or tenderness, with a strength of evidence level of high 1, 2
The American Academy of Dermatology suggests examining for multiple lesions, distribution pattern, and associated findings, with a strength of evidence level of high 1, 2

The National Comprehensive Cancer Network recommends performing excisional biopsy rather than incisional biopsy whenever feasible, with a strength of evidence level of high 4
The American College of Surgeons suggests using a 2mm margin of normal skin with elliptical incision parallel to skin tension lines, with a strength of evidence level of high 4
The Infectious Diseases Society of America recommends avoiding tissue destruction methods that compromise histologic assessment, with a strength of evidence level of high 4
The American College of Dermatology suggests considering early biopsy and surgical debridement in immunocompromised patients with suspected infection, with a strength of evidence level of high 1

The Infectious Diseases Society of America recommends that immunocompromised patients with fever require immediate empiric therapy, with a strength of evidence level of high 2
The Centers for Disease Control and Prevention suggest obtaining blood cultures before antibiotics, with a strength of evidence level of high 1
The American College of Dermatology recommends adding empiric antifungal coverage if fever persists beyond 4-7 days or if lesions show central necrosis, with a strength of evidence level of high 1, 2
The National Comprehensive Cancer Network suggests considering empiric acyclovir if vesicular component suggests HSV or VZV, with a strength of evidence level of high 2

The American Academy of Dermatology recommends that nontuberculous mycobacteria requires prolonged combination therapy, with a strength of evidence level of high 1, 6
The Infectious Diseases Society of America suggests that Nocardia represents metastatic foci from primary pulmonary source, with a strength of evidence level of high 1
The American College of Dermatology recommends that melanoma requires complete excision with 2mm margin, with a strength of evidence level of high 4, 7
The National Comprehensive Cancer Network suggests that cutaneous lymphoma presents as persistent papules, with a strength of evidence level of high 7, 8