Sounds like wet desquamification, which usually occurs the last two weeks of radiation, up to two weeks post treatment, but that's not written in stone, and after ther reddened skin, ocurring 7-14 days of treatment, and after the dry disqualification after that. Keep dry, do not take any skin off, use mild soap and warm water, not hot, limit one bath or shower per day, blot dry, wear loose clothing, avoid excess sun exposure. Tell your doctors so it can treated properly.