I hope you don't mind me re-purposing your "scalp" rhyme:

Really needing help with that thinning on your scalp?
Combover like Mr. Trump got you feeling in the dump?
Are the last few of your follicles somehow thinning into molecules?
Wishin' that your karetin would appear up there again?
Concerned you'll fail in that enthralled kiss because of male pattern baldness?
Androgenic alopecia giving you Encephalomalacia?

With that last one, I better stop already... Thanks goodness for on-line rhyming dictionaries!

(Looks like the "follicles/molecules" has been done many times before).