When changing to new products there are a couple of things to keep in mind - there can be a period of adjustment for your skin.
If you have gone from a foaming or soap based product to an oil based product it can affect the PH balance of the skin. This readjustment can sometimes cause a breakout.
As this cleanser is oil based you do need to physically remove it with a clean cloth or sponge and plenty of water.
The clay mask has a drawing effect and may also bring about a pimple or two as well.