Start by opening a facial image of your choice.




Set the foreground to the color shown below.



Select brush tool. Apply brush settings as shown.



Create a new layer and click once to create a spot.



Double click the layer to open layer style window. Apply settings as shown.





Applying the above mentioned layer style will create a beveled and oily effect on the pimple.



Similarly create more spots in seperate layers and place as shown.



Apply same layer style on the spot layers.