Now I have several spots on my head. my doctor said to rub this all over my head twice a day for 3 weeks, started yesterday. How long does it take to begin noticing whether it's working?
That is difficult to predict. You may not see any reaction for a few days or even a week, but as you continue treatment the spots should react.
Since you had some numbers of basal cell cancers surgery, it's better to have a biopsy on those spots. How long does it take for it to work is difficult to tell. You definitely want to consult with a dermatologist specialized in skin cancers or an oncologist for further input.
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