For this case, by definition, acne is a disease that is characterized by the appearance of skin lesions as a result of folliculitis, inflammation and subsequent infection of the follicular pore.
Acne is mainly caused by hormonal changes, for example, some women have acne shortly before their period.
This disease is not caused clearly by the lack of cleanliness, although it is important to have clean areas prone to accumulation of sebum and dirt, thus reducing the risk.
It is also not caused by a specific type of diet, however, a balanced and healthy diet is recommended.
Answer:
The main cause is hormonal