Why have my toe nails turned purple?

as far as i know, i cannot think of any disease that i have. yes im a little over weight but its very strange ive started noticing my toe nails turning purple, also my heels and knees have turned purple/pinkish. i do not have an breathing issues as such, and also i dont have junk food, so its mostly veggies and... show more as far as i know, i cannot think of any disease that i have. yes im a little over weight but its very strange ive started noticing my toe nails turning purple, also my heels and knees have turned purple/pinkish.
i do not have an breathing issues as such, and also i dont have junk food, so its mostly veggies and legumes (all healthy)

what can be the cause of this? im started to get really concerned since internet says this could be serious
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