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It does not look like milia at all. First, milia do not come single. Also, we need to just take out material inside it and it disappears. For which, you have tried many times, but in vain. It is looking like a simple mole-like age-related growth. But, I cannot confirm it just by seeing. You go to your esthetician and tell her or him to pinch by needle and squeeze it. If it is solid and no material comes out, then it is sure that it is a mole-like growth. If any material comes out, then we have to think another way. So, just get it done and let me know for further evaluation.