keratosis
"Have used this product several times over recent years used for facial and scalp keratosis. It definitely works well although skin conditions seem to return after a year or two. Treatment involves application of ointment on week days (i.e. five days, with weekends off) for four weeks. The major side effect I have noticed is flu-like symptoms (coldness and body aches) and tiredness. The several times this has happened I have taken a day's break from treatment before resuming."