Kay, typically with scaley leg mites, the scales of the legs will appear lifted up. Don't go by my pictures in this thread, if this rooster DOES have them, it is not a typical presentation.
There is pour-on ivermectin and injectable; if you can get the 1% injectable, you dilute it and apply to the legs for scaley leg mites. The 5% injectable you use sort of like the spot-on types of flea meds for dogs - you put a few drops onto their skin, and it absorbs through their skin. This will get rid of any external parasites, such as the ones you mention. BUT - you ALSO have to get rid of them in your coop/pen as well - mites hang out in wood, so you need to make sure to treat all the cracks and crevices, including roosts and nest boxes, in your coop to make sure you've gotten them all.
Good luck!