Differential Diagnosis for Right Big Toe Nail Chrysosporium
- Single most likely diagnosis
- Onychomycosis: This is the most likely diagnosis given the presence of Chrysosporium, a type of fungus, in the nail. Onychomycosis is a common fungal infection of the nails that can cause changes in the appearance of the nail, such as thickening, discoloration, and brittleness.
- Other Likely diagnoses
- Candidiasis: Another type of fungal infection that can affect the nails, especially in individuals with compromised immune systems or those who frequently expose their hands or feet to water.
- Tinea unguium: A dermatophyte infection of the nail, which can also present with similar symptoms to onychomycosis.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Squamous cell carcinoma: Although rare, it's crucial to consider the possibility of a malignant process, especially if there are atypical features or failure to respond to antifungal treatment.
- Melanoma: Nail melanoma can present with nail discoloration and should be considered, especially if there's a new or changing pigmented lesion.
- Rare diagnoses
- Chromoblastomycosis: A rare fungal infection that can affect the skin and nails, typically found in tropical regions.
- Paronychia: An infection of the skin around the nail, which can be caused by bacteria or fungi, and might present with similar symptoms if it involves the nail itself.