Can this harm the penis

When edging should I use lube. Also when edging I sometimes squeeze my penis muscles real hard I guess an automatic kegel to prevent myself from cumming could this harm my penis if I happen to squeeze too hard.
 
I really dont think it could harm your penis.
Lube is fine, and when you squeeze your "penis muscle" I think you mean youre squeezing your pc muscle, which is an important part of edging.
 
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