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This could be due to acne/imples/ or infection of the hair follicles called folliculitis or some bacterial infection/ fungal infction or some skin nodules etc.
Nothing can be said with surety without having a look at the lesions.
It would be best to reconsult your doctor about your symptoms if they do not resolve and get a proper clinical examination.
Keep the area clean and wear clothes washed in a few drops of chlorhexidine preferably and dried in the sun.
You need to consult your doctor uregently especially since you mention that the lesions are growing.
Let us know about what your doctor advises.
Regards.