 There will be 3 treatment groups: 1 once daily application of LEO43204 gel 0.018 on the full face for three consecutive days, 2 once daily application of LEO43204 gel 0.1 on the arm on a treatment area of approximately 250 cm2 for three consecutive days and , 3 once daily application of LEO43204 gel 0.037 on the scalp for three consecutive days. 