Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
They can be enlarged hair follicles or even oil gland cysts.
Not likely serious.
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Thanks for your pictures.
These bumps are not itchy or painful.
Hence not an infection.
These bumps arise from the normal glands in the skin.
Do not worry.
They will go away over time without any treatment.
You can try Benzoyl peroxide cream 55 daily to help with it.
But do not worry.