Brain Bleach is not an actual thing, and it is important to be able to search for medical images without being scarred for life by the most horrific examples of diseases that exist in the entire world. 

There is just no happy medium on Google Image. No matter what medical malady you search for. Seriously, go search for acne right now. It is a horror show. Something needs to be done.

http://www.cheeseblarg.com/2014/06/google-image-upgrade-medical-safesearch.html