I never had acne or other skin problems either when I went vegan four years ago. My sister went vegan a few years ago as well and her acne cleared up for the first time in over 30 years.
However, As jessandreia said, there are other threads here regarding acne after going vegan. If you do a search with the word "acne" I am sure you will find a few threads.
Two to three weeks without animal products seems like a short time for diet to affect one's skin. Sometimes physical stress can bring out skin issues, and an abrupt change in diet, and especially one so strict as to not include soy products and gluten as well as not include animal products all at once might be a big stressor to your body. Hormonal changes can also affect skin, and lack of fats and calories in general can lower hormone levels and therefore bring on acne. Just a few theories.
In the end, only kindness matters. - Jewel
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