How many times a day should you wash your face if you have acne-prone skin?

According to the paper

Acne-prone skin

Washing your face once a day - worsens acne and dryness

When washing your face 2-4 times a day - Acne improvement

Using strong alkaline cleansers - worsens acne

That's what they say.

Use a product that suits your skin 2-3 times a day

I think it would be a good idea to wash your face!

(Source: Instagram dana_danaspick)