For those whom are on warfarin. My daughter is on warfarin due to a prosthetic mitral valve.?

She just started a new bottle 30 tabs of 1 mg. on Wednesday. Since then she has been complaining of itching and a rash on her lower extremities. A little bit of discomfort on her arms. I have given her benadryl and have put "Gold Bond" lotion on her leg and arms. Of course, her level of tolerance decreases after giving her her daily dose at night. Has anyone experienced this? The lab name of the pills that I am giving her from her new bottle is B LABS. Her other ones were TARO.