If you shave or use an epilator, unless you have baby fine hair, you can will get ingrown hairs. The way to avoid them is by using a solution made of alcohol and aspirin (salicylic acid) right after you remove the hair. This acts to not only kill bacteria, but keep the pores from clogging.
One of these products is Tend Skin. It ranges from $12-20.00 for a 4 oz bottle (plus shipping).
An alternative, which is exactly the same thing, can be found at Sally Beauty Supply. It is called No Bump. It sells for $10.00 online (plus shipping) for a 4 oz bottle, but is $8.99 with a Sally card. Buy it here.