[Boudica]

It's pretty normal to find acne/pimples on your skin in places other than your face. If it's only small, it will probably go away after a week or so. Is it a particularly bad one?

I would like to iterate: We're not medical professionals in any way.

it happening like this bro , i am little worried is everything ok in my body. the way it showing in picture 100% same happening to me..

This sort of thing can be due to changes in hygiene (are you using different soap?) or changes in what you eat, any changes in your weight, any hormone changes, and potentially what you are wearing. There's so many potential causes. It's not a medical concern. If it persists, you could always talk to a dermatologist (if you can afford one privately) to see what they recommend.

Generally speaking, acne isn't a medical concern... More of an annoyance.

If you find yourself scratching a lot in those locations, then there could be an underlying skin condition or irritation, like eczema. But again, not a huge cause for concern.