those are not bald patches, they are the spaces in between your hair. clumping curls reveals the spaces inbetween, even more so if you have less dense hair. Your hair looks average density, don't fear that ur scalp is showing.
The pictures were blurry so i right clicked view image to get a good look of the full size. To me from what i can see, it looks like you have majority 4a hair, with some 4b and a few 4cs as you move toward your edges. 4c generally looks super compact and the ringlets will not clump that size with out product(and maximum hydration). when your hair gets longer and u start using product, those 4as will then form even larger clumpshttp://forum.blackhairmedia.com/the-max-hydration-methodfrom-my-other-post_topic368937_page1.html
Edited by pinkecube - Apr 16 2014 at 3:56pm