Differential Diagnosis for 41 yo Male with Right Arm and Chest Fungal-Like Spots

• Single Most Likely Diagnosis
  • Tinea corporis (Ringworm): This is a common fungal infection of the skin that can appear as spots or patches on the arm and chest. It's highly contagious and can be spread by skin-to-skin contact or through contaminated objects.
• Other Likely Diagnoses
  • Pityriasis versicolor: A skin condition caused by a yeast infection, leading to patches of discoloration on the skin, which can sometimes appear fungal-like.
  • Eczema (Dermatitis): While not typically described as fungal, certain types of eczema can present with skin lesions that might be mistaken for fungal infections.
  • Psoriasis: An autoimmune condition that speeds up the life cycle of skin cells, causing cells to build up rapidly on the surface of the skin. The extra skin cells form scales and red patches that can be mistaken for fungal infections.
• Do Not Miss Diagnoses
  • Lymphoma (Cutaneous T-cell lymphoma): Although rare, this condition can present with skin lesions that might resemble fungal infections. Missing this diagnosis could be fatal due to the aggressive nature of lymphoma.
  • Leishmaniasis: A disease caused by parasites of the Leishmania type, transmitted by the bite of infected sandflies. It can cause skin lesions that might be mistaken for fungal infections and can lead to serious health issues if not treated.
• Rare Diagnoses
  • Chromoblastomycosis: A long-term fungal infection of the skin and subcutaneous tissue that can cause lesions. It's rare and usually found in tropical and subtropical regions.
  • Sporotrichosis: A fungal infection caused by Sporothrix schenckii, typically acquired through skin prick or cut exposure to contaminated soil, plants, or organic matter. It can cause skin lesions that might appear similar to other fungal infections.