I have reoccurring boils in groin area and folliculitis in scalp for a long time. could there be a common ground causing these two sort of similar skin problems?

These are common in people who have a nest of invasive staph germs living constantly in the nasal membranes. These eventually spread to fingers that touch the face/nose and will travel to any site those fingers touch. Resolution often requires a complicated combination of oral meds/special bathing and application of antibiotic ointment to the nasal entrance.