Those are called single strand or fairy knots. There's really no way to avoid them 100% if you have tightly curled/coiled hair, it just comes with the territory. You can cut down on them by keeping your hair moisturized, detangled regularly, and trims (I get my hair trimmed 1x a year). Protective styles like two strand twists are also a good way to cut down on them. They keep the hair tangle free until you take it down. HTH
Curly in Okinawa, Japan where only the toughest curls can stand up to this heat and humidity.
Shampoo: Waiting on SM African Black soap shampoo to makes its way to me...
Conditioner(s): CJ Beauticurls Argan and Olive Oil, Curl Junkie Smoothing Lotion
Treatments: CJ Curl Rehab, CJ Deep Fix, CJ Repair Me!
Oil: Apricot Kernel Oil
Stylers: CD Loc Butter for twists, CJAF, CJCQ (haven't figured out how to work this though...)