It looks like you have some prominent blood vessels or telangiectasias with a little redness or erythema. It is likely that you have a little underlying rosacea which may have become more prominent after your filler treatment. Cheek filler may cause temporary swelling and bruising which can press slightly on the normal blood vessels in your cheek causing superficial telangiectasias. The swelling may improve further and in turn the telangiectasias in a couple more weeks. I recommend you see a dermatologist to evaluate for rosacea.