Similarly to warts and verrucas, the most common symptoms of MC are growths on the skin. But there are also important differences between the symptoms of the two skin conditions. An MC infection usually begins with the formation of a small, flesh-coloured bump the size of a pinhead. The growth usually does not cause any pain. Over time, the bump grows to the size of a small pearl and often turns a reddish colour. A fully grown MC growth can reach approximately 2-5 mm in diameter, and usually develops a small dimple in the center. This dimple is sometimes filled white, waxy gunk, similar to that found in a zit.