Differential Diagnosis of Skin Lesions on Hand with Oral Ulcers

Primary Diagnostic Considerations

The American College of Rheumatology suggests that the combination of hand skin lesions with oral ulcers most commonly indicates Behçet's disease, pemphigus vulgaris, erythema multiforme, or hand-foot-and-mouth disease, with the specific diagnosis depending on lesion morphology and distribution 1, 2
The European League Against Rheumatism recommends that Behçet's disease be considered when patients present with recurrent oral ulcers combined with skin lesions, including papulopustular lesions, erythema nodosum, and pathergy (skin hyperreactivity to minor trauma) 1
The British Association of Dermatologists notes that pemphigus vulgaris typically begins with painful oral ulcers (in 50-70% of cases) followed weeks to months later by flaccid bullae on the skin that rupture easily, leaving erosions 2
The American Gastroenterological Association suggests that Crohn's disease commonly causes oral ulceration that may coincide with cutaneous manifestations, including pyoderma gangrenosum or erythema nodosum affecting the extremities 4, 3

The National Institute for Health and Care Excellence recommends obtaining full blood count, fasting glucose, HIV antibody, syphilis serology, and nutritional markers (vitamin B12, folate, iron) before proceeding to biopsy 3
The American Academy of Oral Medicine suggests that any oral ulcer persisting beyond 2 weeks or hand lesion of unclear etiology requires biopsy for histopathologic examination 4, 5, 3

The American Cancer Society notes that solitary chronic ulcers >2 weeks must be biopsied to exclude squamous cell carcinoma or lymphoma 4, 3
The British Association of Dermatologists recommends that widespread erosions with positive Nikolsky sign suggest pemphigus and require urgent dermatology referral 2

The American Academy of Oral Medicine recommends referring to oral medicine or dermatology for any oral ulcer lasting >2 weeks or not responding to 1-2 weeks of empiric treatment 4, 5
The European League Against Rheumatism suggests that for suspected Behçet's disease, rheumatology consultation is appropriate 1
The American Gastroenterological Association notes that gastroenterology involvement is needed when inflammatory bowel disease is suspected 4, 5