Wherever you sweat from it's healthier to let the sweat out rather than try to stop it. If it's your face perhaps have a health check just to make sure all is ok with you. If you mean shiny t panels on your face, there are various cosmetics cover ups you can use across the brand range. Two that come to mind is The Body Shop do papers that absorb oil from your T Zone. Rimmel do a translucant anti shine powder you can use, with or without makeup. I think Clarins, Clinique and Laura Mericer also do cosmetics to cover this too