If the blockage is severe or penetrates deeper into the skin, causing the formation of slightly greater bodies and more severe than the pimples called the cysts. They can be colored red or pale yellow, in some cases, they are filled completely with the pus-like fluid making it much worse.
The main cause is still unknown but stress, poor living conditions, and an unhealthy diet can be a contributing factor.
The follicles mainly in the neck region, face, or the back area is the most likely area affected by acne.