Sounds as though it may be the start of a sebaceous cyst or possible hair follicle cyst.
Here is a site that will explain more about this as well.
Hope this helps, If you need anything else please feel free to ask. If you found this helpful don’t forget to click the *accept* button!
Have you tried warm packing the area? Hot bath soaks might help bring it to a head as well, if it is a cyst or abscess. If this doesn't help, a doctor may have to lance the area in order to allow it to drain.
Try the hot soaks in the tub with epsom salts. Or soak wet clothes in hot epsom salt filled water and place it on the area a couple times a day for a few days.
Hope that helps,