Bump on toe with clear gel like fluid

I have a small, raised bump on the top of my middle toe. About once a month it comes to a ‘head’ and a clear gel like fluid drains from it. I thought it might be a corn but I have not found any information stating that corns contain any fluid.

I have a small, raised bump on the top of my middle toe. About once a month it comes to a ‘head’ and a clear gel like fluid drains from it. I thought it might be a corn but I have not found any information stating that corns contain any fluid.

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Bump on toe with clear gel like fluid