system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 60-year old male presented with Yellowish discoloration thickening and tunneling of 2 fingernailand one toe nail.Which of the following will clinch the dignosis at the earliest?
assistant
The correct answer is  Yellowish discolouration with thickening tunneling indicates a fungal infection maily dermatophytic infection - tinea ungum. rapid diagnostic test to diagnose the condition is koh mount. 30% koh is used for nails. Fungus appear as translucent branching hyphae with septa. slit skin smear is used to diagnose leprosy grams stain is useful to diagnose candidacy paronychia or any acute bacterial infection Iadvl textbook of dermatology page 272