Thats because of heat and other environmental factors
Understanding Clindamycin Side Effects Clindamycin is a powerful antibiotic used to treat a wide range of bacterial infections, including skin infections, respiratory infections, and certain dental issues
It also contains hyaluronic acid to boost skin hydration, as well as a wide variety of nutrients, vitamins and minerals, such as vitamins C, E, D, B6, biotin, copper and zinc
doi:10.1186/1471-2393-10-17 [56] Keller U, van der Wal C, Seliger G, et al
Oxidative stress also results in the generation of carbonyl groups in proteins which can be quantified from their reaction with 2, 4-dinitrophenylhydrazin resulting in the formation of a hydrazone adduct that absorbs at 360 nm