I have a growth on skin, it is indented in and the “scab” like thing over it is as hard as a rock

No medical problems, 20 years old and active military lifestyle. I’m not sure what this is, it started smaller and I’ve noticed it’s gotten almost twice as big as it started. The skin is indented in and the “scab” like thing over it is as hard as a rock. I can’t for the life of me figure out what it is. It’s on my arm

on-my-arm





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