Does redness affect my daily activities?

Cellulitis being an infective process, we would generally recommend that until the skin infection and redness improves or settles to avoid contact sport, to avoid gymming and swimming because this may make the symptoms worse. Driving per se should not be affected unless you're systemically unwell and therefore there's no major contraindication to driving. With more inflammatory processes like allergic reactions, if it is aggravated by situations like the gym or swimming you may need to make modifications. But in general inflammatory processes you can carry on with gyming and swimming over time as long as this does not aggravate the existing features.