If you know what you're doing(ish) is it okay to take care of a problem by yourself instead of seeking professional help?

For example, a couple months ago, I developed something on my wrist that looked scarily like MRSA. I had just finished a two and a half month stint of being hospitalized and was in no mood to go back to the hospital. Having experience in cauterizing injuries, I gave myself a second degree burn which destroyed the apparent MRSA. Everyone said I was crazy and probably still had MRSA and recommended I go see a doctor. I eventually relented, went and saw the doc who more or less said I’m a crazy bastard for doing so but if there was MRSA, it sure as hell wasn’t there anymore.

So is it okay to do something in which you know what you’re doing(ish) at little or no cost to yourself, or go to a professional and have your wallet lighten up a bit?