What are these on my toes…?

Good afternoon everyone! First of all I am new here, I needed advice on something that was bothering me since ages and thought it be best if I ask here rather than a student forum lol I am 17, go college and it’s been about 4 or 5 years (or even more) that my toes have gone black on their folds… It feels like a very thick and hard layer of skin that has appeared over the years. It started as the normal dark areas everyone (usually?) has on their fingers fingers, then it developed..

Good afternoon everyone! First of all I am new here, I needed advice on something that was bothering me since ages and thought it be best if I ask here rather than a student forum lol I am 17, go college and it’s been about 4 or 5 years (or even more) that my toes have gone black on their folds… It feels like a very thick and hard layer of skin that has appeared over the years. It started as the normal dark areas everyone (usually?) has on their fingers fingers, then it developed..

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What are these on my toes…?