Dyshidrotic eczema (DE) and palmoplantar psoriasis (ppPSO) are both conditions presenting with vesicopustules on the palms and soles. While they have differences, distinguishing them can be a challenge in cases complicated with allergic contact dermatitis (ACD).

A 24-year-old male clerk, presented with a one-year history of vesicopustules on the palms and soles, associated with onycholysis and subungual hyperkeratosis. He admits to frequent hand washing and using rubbing alcohol as well as wearing a new pair of rubber shoes. Patch testing (International Standard series) showed +++ Potassium dichromate 0.5%, Carba Mix 3.0%, Thuiram mix 1.0%, Textile dye 6.6% and ++ Formaldehyde 2%. Gram stain was negative and KOH from plantar area showed spores and long-septate hyphae. Dermoscopy showed a bright pink background with erosions, patchy dotted vessels atop with yellow crust, and scales. Histopathology revealed psoriasiform-spongiotic dermatitis with macrovesiculation and eosinophilic spongiosis which was consistent with subacute eczema. He was managed as a case of recalcitrant DE with secondary dermatophytosis and ACD to textile dye and rubber, but still keeping in mind the possibility of eczematized ppPSO. The patient was managed accordingly, with particular emphasis on avoiding allergens. The condition improved, and nail changes resolved with topical medications and a short course of oral corticosteroid and oral anti-fungal thus favoring our initial impression of recalcitrant DE complicated by dermatophytosis and ACD.

This highlights the diagnostic challenge in distinguishing between severe DE and ppPSO in the setting of concomitant ACD, underscoring the importance of a comprehensive evaluation.