Hello, I have gone through your query and understand your concern. Usually creatine supplement do not cause any side effects. Very rarely on excessive intake, it can cause Diarrhea, Fatigue, Fever, Headache, Nausea, vomiting, Stomach upset . How ever i have never seen the red spots in chest in any athletes who take creatine supplement. I suspect it to be a fungal infection called Tinea versicolor. It can be easily diagnosed by simple inspection of the red spots. Further if there is any doubt, we use Ultraviolet light to confirm. Ultraviolet light will make the affected areas appear a fluorescent yellow-green if they re the result of tinea versicolor. I used to prescribe the topical antifungals like Selenium sulfide or miconazole and ketaconazole soap. They will keep the fungal growth under control and may take long time to resolve and to turn your skin to normal color. Hope this helps. Please write back for further queries. Wishing you good health.