I strongly suggest that you get this problem checked out by your primary care doctor
. This is not because I think the problem is a serious medical problem, but rather because it sounds like a fixable problem that you should not have to live with for years!
One possibility would be chronic ingrown hairs. These are very common in areas of the body that are shaved, and they result from the hairs curling back on themselves and growing down into the follicle. Simple treatments can include exfoliation and stopping to shave the area for a while, but sometimes antibiotics from your doctor are needed.
Another possibility would be folliculitis, which is an infection at the bases of the hair shafts, caused by bacteria getting in and causing inflammation and redness. This is also very common in areas that are shaved frequently. Sometimes it clears up with good skin hygiene and an antibacterial soap, but sometimes your doctor may want to try a topical or oral antibiotic to help clear it up more clearly.
The first step would be to make an appointment to see your doctor, who will be able to confirm the diagnosis and help you decide what to do next!