Razor bumps/Ingrown hair that won't go away

I normally use my Braun Silk-Epil on my arms, legs, and parts of my bikini line (yeah, OUCH!). However, due to years of experimenting on shaving, waxing, and epilating, I seem to have ingrown/razor bumps/irritated skin that never seems to go away, specifically in my under arm area. What are the best ways to remove this? Also, what are the best ways to avoid this from happening?

Another issue I have is the ever-notorious bikini shave. I left my electric razor back in the States (I moved to Canada). What’s the best razor to do this job and what kind of scissors must be used for trimming?

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