Hi
Differentials for this may be a fungal infection, a dermatitis or folliculitis. Do the bumps involve the hair follicles? Are they clustered together or do they occur separately? Do they itchy or are they painful ? Do they have any discharge?
Given folliculitis as a differential, it is important to bear in mind that as a bacterial infection, it may be contagious. Refrain from unnecessarily touching the area and keep the areas involved clean and dry always. Wash your hands often with a mild cleanser .
You may need topical antimicrobial soap for this. If the areas do not respond, you may need to have this assessed as you may need oral medications here.
The bumps do not occur in the hair follicle.They are clustered though.They itch but arent painful with no discharge.the bumps disappear within a week leaving behind dark spots.