There's a white spot on my legs and arms and its itchy . im a breast cancer patient taking up herceptin (trastuzumab) is there a connection ?what ointment could you

Should be seen: I suspect a superficial fungus but there's several other possibilities; if it has not responded to a topical antifungal such as tolnaftate after a few days, a physician's office visit is in order.

Might be Herceptin (trastuzumab): It's possible you are having a reaction to the herceptin (trastuzumab). In this case, because the rash is on your arms and legs, it might be better to take an oral antihistamine medication instead of using a cream. Call your oncologist's office and ask them for advice. You may need to take an antihistamine before every Herceptin (trastuzumab) infusion to avoid this!