They contain yellowish or whitish pus over a red, inflamed base.
They closely resemble whiteheads but are inflamed.
Causes: Pustules form when clogged pores become infected, leading to an accumulation of pus.
Nodules
Nodules are inflamed, painful, and hard lumps located deep within the skin.
This severe type of acne can lead to long-term skin complications such as scarring and dark spots.
Causes: Nodules develop when clogged pores cause deep tissue damage beneath the skin’s surface.
Cysts
Cystic acne occurs when pustules become infected, resulting in large, painful, red or white lumps deep within the skin—even deeper than nodules.
These cysts are soft and filled with pus.
Due to their severity, they are more likely to cause permanent scarring.
Causes: Cystic acne forms from infected pustules and is often linked to hormonal imbalances, bacteria, and excessive oil production.
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Source: Bright Side
