Red Bump (filled with liquid) on penis tip

Hello, I had some rashes & tiny bumps! on my penis tip earlier but today i noticed that it turned to this (check pics) ..

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This happened after i was done dry masturbating! Please tell if this is serious or how can I treat it.

PLEASE HELP ASAP!

If it’s from masturbation it will heal in a few days just apply a lot of moisturizer like pure shea butter or others , if it doesn’t heal than go to a dermatologist

what was your exposure?

Need to rule out STDs if you are sexually active.

I am not sexually active