Can Carac Cream Be Used to Differentiate Pre-cancerous Brown Spots from Other Brown Spots on my Face?

My dermatologist wants me to use cream 2X day for 2-4 weeks then will use liquid nitrogen to remove remaining spots. I have tons of brown spots on my face but they may be freckles! My doctor said she couldn't tell but using the cream would distinguish the spots.I thought the dermatologist could tell by visualization which brown spots were dangerous. My skin is very sensitive. I never heard of using the cream diagnostically. Does it make sense? Is there another treatment less painful?

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