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There's a black spot on the leg. Squeeze out some yellow things and wipe them constantly

May 11 20213 people replied
Description Of Condition:

There is a black spot on the thigh that can't be squeezed out by hand. Today, a yellow thing came out after squeezing with a tool, and it couldn't be broken by wiping with a cotton swab. Finally, it was clamped with two cotton swabs. I applied it with iodine afterwards. What is it or do I need to go to the hospital

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