We all deal with this..
According to the information given.. you have NO cause for alarm and no possibility of external parasites either.
I would consider it a genetic anomaly... since you aren't seeing any other symptoms that cause alarm.
I would NOT worry about what appears to be dry skin and would just leave it alone. we all flake crazy amounts of dead skin cells and chicks are no exception.. the amount of dander they put out is also tremendous. So as long as it isn't red, cracked and inflamed... I would probably think it's just easier to see on the dark skinned chick especially with the bare spot... That bare spot may or may not fill in during the little mini molts on the way to maturity.
Truly surprised to hear they use 24% feed... that's not bad..  (think they had too much backlash from not selling an appropriate turkey poult feed even though they were selling them.) 22% is actually plenty for chickens... I personally don't prefer the Dumor feeds and like the Purina Flock Raiser.. but it should not be an issue. Just wanted to make sure it was higher than 18% protein and had plenty of amino acids... since feathers are made from 90% protein and it's amino acids and there was a bare spot in question... and some folks aren't well enough informed yet to realize that scratch is just a treat. Consider just adding oyster shell when your ladies approach laying age instead of switching to "layer" feed.. this allows them to take what calcium they need but but avoid what they don't..
Sounds like you've got this handled and your being aware and vigilant will go FAR to prevent any future issues before they become disasters.
Very hopeful for you to call your Silkie "her".. Since I know they aren't sexed at TSC... is it throwing any clues yet to gender.. and will you be able to keep of it's a cockerel? White Silkies are striking and beautiful.