I assume that y'all are aware that yasmin contains drospirenone (progestogen hormone) and ethinyloestradiol (estrogen hormone).
With regards to bodyweight changes, studies on the antialdosterone properties of drospirenone were investigated previously and the results showed:
'Weight data was obtained from 1,985 women on Yasmin and 822 women on Marvelon. There was a reduction in bodyweight in the majority of women taking Yasmin and an increase with the women taking Marvelon. Mean changes in weight gain, cycles 1 to 13 were Yasmin -0.489 kg and Marvelon +0.019 kg.'
P.S. Marvelon is another combined oral contraceptive agent containing desogestrel and ethinyloestradiol.
However, it is important to still be clear that the results are meant for an 'average person' and it may not be applicable to each and every individual since no one can be considered as 'average'.
Also, with regards to acne, normally and in a classical situation, acne is normally cause by high testosterone (male hormone) level and i wouldn't think that acne is going to be a problem since yasmin contains estrogen (female hormone), which should help with your acne. Nevertheless, still consult your GP before taking any medication especially when you're already on medications.
hope it helped!