Reddit mentions of Soft 'N Style Applicator Bottle, 4 oz

Definitely looks like heat rash/pimples/boils from sweating and heat. I would really suggest putting an ample amount of an anti-chafing powder under them and also sprinkle this liberally inside your binder.

Possibly keeping a small little bottle on you like this filled with the powder on you so you can quickly re-apply during the day would also really help. The applicator tip will also help you with precision application that doesn't leave your hands super powdery.

I never had issues with most of my hair, just my hairline. So it's pretty easy to just dab some on directly to my hairline and I just kind of massage with my fingertips (not my nails) starting from my forehead and moving back toward the crown of my head. I really only work back a couple inches from the start of my hairline. I just repeat this so it's spread evenly, as a bonus the massaging feels nice. I only ever did it as a deep treatment, so I could be more generous with how much oil I was using since I would just be washing it out. Mixing it with a lighter oil also helps thin it out a bit. For a deep treatment, I would leave it on for an hour at the very least, but I would try to leave it on longer or overnight.

If you want to put it all over your scalp, I think one of these would probably help. http://www.amazon.com/Soft-Style-Applicator-Bottle-oz/dp/B001MP7I2A/ref=sr_1_15?s=beauty&ie=UTF8&qid=1417321310&sr=1-15

There are a ton of videos on youtube about castor oil and hair growth if you want more tips (or I can tell you everything about hair I know, but I could go on forever, lol). Search for "castor oil hair growth" or "castor oil challenge" and you'll get a ton of results and before and afters.

Try ordering one of these applicator bottle