system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What are the fundamental differences between face lotion, body lotion, foot cream, daily moisturizer, night cream, etc.??
gpt
Worked as a cosmetics chemist for 2 years after school. It varies depending on the function of the lotion/cream. If its a general moisturizer very little difference, maybe a slightly different ratio for the thickener to decrease tackiness for something facial rather than something advertised for the body. However if it's something like an acne cream or sunscreen the "active ingredient" would have a significantly different ratio. For example a common active in acme creams is salicylic acid. Ones targeted for the body might have 10-25% more of the acid than facial ones.