i did a spray tan for a girl tonight. She had never had one done before so i explained the pre-taning instructions to her when she booked up and then again this morning before her tan tonight. I used sienna x 10% on her but under both of her arms are these really dark patches and i have no idea what they are? its a bit of a co-incidence to have dark patches under both arms if it was a mistake made by me? i am wondering if she didnt completely wash off her deoderant or something...has this ever happened to anyone?? i could understand if the patches were white because then that would mean that i had missed under her arm but they are large dark patches - darker than the actual tan itself. anyone know what this could be??