Swollen bump on shaft of penis? STD or pimple? Help

one night i just Noticed My penis shaft was getting itchy and next thing you know there was a swollen pea Sized bump on the Right side shaft on my penis. It’s not itchy anymore but there is still a bump and when I squeeze it it feels like there’s a pea Under my skin. It’s only been three days and it’s starting to look yellow and dry??? The first day it was super red. The pictures below are in Chronological order is this an STD?

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Hi Ryan,
It’s likely to be a small boil and it appears to be resolving on its own. Not an STD.
Adhari

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