After my arm workout this morning I noticed some marks on my shoulder when changing. I didn't feel anything during or after. Any ideas on what this may be?
definitely looks like a scrape... i think you are really overthinking something that is nothing but a scrape which can easily happen without you even noticing especially at the gym
Keep an eye on it over the next few days and post a updated pic. That way we can see any change. Doesn't seem like anything to worry about though......just cosmetic.