The correct spelling for the phrase "study at skin" should be "study of skin." In IPA phonetic transcription, this is pronounced as /ˈstʌdi əv skɪn/. The word "of" is represented by the schwa sound /ə/, while "skin" is represented by the /skɪn/ sound. It's important to double-check our spelling and pronunciation to ensure clear communication and accurate understanding of messages.