Forty-eight hours after irradiation, all substances including
the placebo gel displayed significant erythema-reducing
effects ( fig. 4 ). The erythema reduction achieved by
the A. vera gel (97.5%) was not significantly superior to the
effect of the placebo gel. Interestingly, 1% hydrocortisone
in placebo gel was not as efficient as the placebo gel or A.
vera gel (97.5%) whereas 1% hydrocortisone incorporated
in a cream (Dermallerg-Ratiopharm cream 1%) resulted
in an erythema reduction that was superior to the results
of all other test substances.